Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2a21e370762f85…

MALICIOUS

PDF

75.1 KB Created: 2021-03-24 03:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4506b213562ff815f3c9a9fe4fa6fd82 SHA-1: c0e14e2aa0dc620cf9c4ffb83831ac658dba568e SHA-256: 6f2a21e370762f85a291af6ba4894472c0dea342531f10d43f7ba13d37e2fa49
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 0.9991

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://crophysi.ru/strik?utm_term=dometic+ac+remote+control+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449618/normal_603f8ea748eb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5fc7cc25c5d63.pdfIn PDF document text
    • https://kisobodowawon.weebly.com/uploads/1/3/1/3/131384145/velipumoxodulo.pdfIn PDF document text
    • https://widoripitobagat.weebly.com/uploads/1/3/4/8/134882637/7a21dd1.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/oracle_12c_sql_fundamentals_download.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/flowers_for_algernon_dr_strauss_point_of_view.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_600e8da651cf6.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/79925635982.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/vocabulary_booklet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/arrival_of_the_birds_transformation_wikipedia.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_be75872576094ccbbba051760e11e97b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23dc014-5c12-42aa-83be-12e28f798095/65167255314.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/full_stack_react_application.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/rulugarazam.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_f5bbc29924544560aaaeb785fc099e97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54451ea-fca6-4be5-898c-c0e1f8aee638/yamaha_mox8_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/wizix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad10af7-b05a-466c-9122-032caa43578d/youtube_crochet_shell_stitch_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b5f859-45d3-4d23-bfcc-ffb4a163176c/how_convection_currents_cause_plates_to_move.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_a2be789070924145beea4ecbdc5e69b1.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_4426fd32b06a4f5e93defa8f73a205b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fd519a-f77b-4912-9c18-533e1fd8c8dc/how_to_do_a_tire_flip.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/tcss_energy_unit_study_guide_answers.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_b1b56ace51c745ebaf497cb36c1ffc7e.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 4764 bytes
SHA-256: 221f8be0a0773a548a6b6b21234f0396c2fd3c18aca867173de08bc4ca202a85
font_01_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 10656 bytes
SHA-256: f8ef7563190d4cb8142ab00737f577b0fa72abcf3ddcf333ca142b10ff3c4932