Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a769f406c70cb5…

MALICIOUS

PDF

66.5 KB Created: 2020-12-13 18:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 368331d055b5bed682f22e989ecf66bc SHA-1: bfb21cbffd99a2519ed0527e63db54c0504f48bb SHA-256: d1a769f406c70cb529f5691d55e8e47385acae58b02712ecf8d354995a24e719
156 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 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=barry+bonds+baseball+card+1988 PDF link annotation
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/bizav.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/9b083780-305d-4c8b-a33c-c8a8fda36226/construction_design_and_law_dispute_resolution_courses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89cf7240-cb3c-4990-a899-ae771698845a/98895778384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f0cb9d-7496-49e1-a014-4572825186e1/51143362941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12345e67-0520-404e-877b-3efa6b5191b1/85630365101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ab29e4-78e9-460d-9fe3-d7323f456cb2/apk_game_offline_rpg_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17b21bef-28a6-4017-bdaf-e49fc7684fe2/85216569157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b172427d-185f-477a-b635-0d072a7a9d7d/65106502956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752e3378-ed15-4e3c-830b-74211b60f196/marc_anthony_tour_2020_dates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f632e606-16bd-4b65-85cd-042cf7805407/derosibolut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28acdeb5-3b42-4b8d-8142-d78c4e7b4b88/66647036349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8511ac-113c-4a79-ac3e-4bbf71009758/61345565100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a874b7-a003-4d49-8151-e5f767ecfa9b/sprinkler_system_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bcf0a9c-f5d1-4169-94ae-05d5c08c1792/gezaselasijukiz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf57fd3485235c86bd8bf5/1606375422842/ctek_3300_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC535 5624 bytes
SHA-256: d8b5cb5f4b59fcd8f3920057686d4196ab1829e1f9d64ac0cdfdfaa205e46981
font_01_sfnt_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 10388 bytes
SHA-256: b47c0dacd46518a648f9d26f2182fabf17268a2dde0094f0d819b8247151aebe