Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ce1f016ec67cad…

MALICIOUS

PDF

96.3 KB Created: 2021-05-23 15:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e2df567d3eb444cbebaac3f4a4c5c2ad SHA-1: 92d213310132d30e084947b60b15e872f4d926f8 SHA-256: f5ce1f016ec67cad9111673efe468760ff16d9f956323946aa01d53e80173a74
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/strik?utm_term=a+cube+plus+b+cube+ka+hal PDF link annotation
    • https://nazafusi.weebly.com/uploads/1/3/5/2/135297870/9990372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_6027e63f0d6eb.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/ripisijevul.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/zagojin.pdfIn PDF document text
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/1194383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464527/normal_60662eeaa6b16.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/6791271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_606a84c74efb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/digital_transformation_market_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3f9cb3-0377-4e77-b3c5-ba3ea4e41d1e/canon_mp190_series_printer_how_to_scan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2bf8cd-0819-451a-a6cb-3df685e36818/29336760963.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/32971989126.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/pirexitudogewizebilib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a923225-35c5-4c23-a67f-f4d75223116d/how_to_recondition_cast_iron_dutch_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/mercado_internacional_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e345bc-55a0-4c78-947a-dc3a4d7e10da/agatha_christie_poirot_movies_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3657347f-ee43-469d-84d0-9fb532efaf2b/jenizoridogareb.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/indian_navy_diver_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c021cb9-78fa-43f8-b832-25039fa44bee/casio_hr_100tm_calculator_ink_cartridge.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/rexajexu.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/spongebob_theme_song_flute_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b05538-c444-4212-9c5e-58f6503e47d8/turning_operation_on_lathe_machine_animation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33830eb-8369-4844-a1a1-64e628761ff0/vampire_armor_replacer_skyrim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d15bca-f773-4bed-ba93-7166cb2f8b30/madden_mobile_18_hack_no_human_verification_or_survey_or_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd5b741-8f53-416f-b18b-452cbfdbb0ae/76065413285.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 4656 bytes
SHA-256: e22270a4961317ed68e927edcff8c0c4b6c288d75828b49f7803f62119e2157b
font_01_sfnt_off00010161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10161 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 11612 bytes
SHA-256: 97513e9bfff5d5d4be50eda4b3daa994b33d5ace1a267869378193fecf43534d
font_03_sfnt_off000134cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CD 16236 bytes
SHA-256: b1345b03cb8ff90cb42c7c8f61cc0a97610ec8082568e26930ee59dd54284444
font_04_sfnt_off00014a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_05_sfnt_off0001582b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582B 6956 bytes
SHA-256: cfbcc11286645a38aaa9e8ed6c54f98ddb867796711aa89ba4c6ff06d580629c