Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a4d79d900196ae…

MALICIOUS

PDF

80.4 KB Created: 2021-03-28 09:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 537f1fcbdd8450bdb289b1e61282541b SHA-1: 59b54501b28a4f36752a86aba8d2fa5baccc7ebb SHA-256: c7a4d79d900196aeb536edc215038043ca9a6e0f1d2af479b388985f15e470ad
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=chi+square+goodness+of+fit+test+worksheet PDF link annotation
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/5935272.pdfIn PDF document text
    • http://genoray.pro/guy_de_maupassant_the_jewelry_analysis7g79u.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/1ec2d00a.pdfIn PDF document text
    • http://kleomaften.online/8594560516982b6o.pdfIn PDF document text
    • http://car-test.pro/simulador_de_examen_de_oposicion_2019-_2020013fb.pdfIn PDF document text
    • http://nawoxir.22web.org/56737407132.pdfIn PDF document text
    • https://ziregezetul.weebly.com/uploads/1/3/1/3/131398138/2870205.pdfIn PDF document text
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/teguguperesofolamuv.pdfIn PDF document text
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/2682255.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/ae1153612db88a5.pdfIn PDF document text
    • https://kipopedetazezu.weebly.com/uploads/1/3/0/7/130775623/fapabebobiguvif.pdfIn PDF document text
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/vafatevebeseguvux.pdfIn PDF document text
    • http://scarcebook.com/walter_riso_enamorate_de_ti_descargarpe9jw.pdfIn PDF document text
    • http://topdiscount.pro/281882551990s7z8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37ed295f-88d6-4c94-b182-ec1ba6c0c9b9/are_hp_chromebooks_good_for_gaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93173ae-bcf9-4f33-a239-b0450c7a902b/xujelodesomagadasaso.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/axa_ppp_claim_form_uk.pdfIn PDF document text
    • http://ruludamena.epizy.com/casper_mattress_bed_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f360ba-07a8-4372-ace8-60cff3b9eb4e/how_do_you_tigers_protect_themselves.pdfIn PDF document text
    • http://fupewazogapoda.rf.gd/doraemon_all_song_ringtone.pdfIn PDF document text
    • http://bageradafasuk.rf.gd/99502859205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7dd9f45-0fa6-4ac5-82f0-a9592cd4d06f/htc_m8_battery_calibration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fbb9b8-4f09-485d-95e8-892503a547f5/27874426092.pdfIn PDF document text
    • http://zoxarulal.rf.gd/fakesipaxiji.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5324 bytes
SHA-256: 933080996936b2a75ba505f86e596938dbe10e86081c5ccff23bbd6ffc4c25f1
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 11428 bytes
SHA-256: bcbba63daba0492ff897e8bc30f72613394746c44df1239a5f28910baf98a894
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16092 bytes
SHA-256: 4228da9f82fdfe28de7ee8ee2375b5b14ea2588cebc3d8b889b550bdacff6634