Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4766796284f9a71…

MALICIOUS

PDF

81.1 KB Created: 2021-04-30 07:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 42c93f30dd742fa5dbaa87acb6ffd94d SHA-1: 58fbb5bb626b689327b227237efea3d007e48087 SHA-256: e4766796284f9a71bbbe65898480ce5436e8b1952c65326d70ea2c067af1403d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://dugedepap.ru/strik?utm_term=how+to+learn+epic+medical+software', are likely used to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dugedepap.ru/strik?utm_term=how+to+learn+epic+medical+software PDF link annotation
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/nejame.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/yDhjidh/xewefaz.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/fivepuwuvuwabeke.pdfIn PDF document text
    • https://nagaxubonafebax.weebly.com/uploads/1/3/1/6/131606673/kufen.pdfIn PDF document text
    • http://nubupexajed.iblogger.org/rawegulogivuredijixir.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/jfiiJih/381257895.pdfIn PDF document text
    • https://wudunuxez.weebly.com/uploads/1/3/1/4/131453857/detebisixonifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_07c9e587074c4f918501d3a349e8be11.pdf?index=trueIn PDF document text
    • http://renureva.epizy.com/sawop.pdfIn PDF document text
    • http://poramafu.rf.gd/7415241305.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/bot_twitter_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10cc5028-6ae0-4116-80bc-6165aebb07c5/vogevemevesuru.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_a650bc492c9b4c6180ec0f3dd4788813.pdf?index=trueIn PDF document text
    • http://vavazewesepato.epizy.com/business_plan_sample.pdfIn PDF document text
    • http://lawupoxag.epizy.com/levopisikomulupi.pdfIn PDF document text
    • http://zipanigav.epizy.com/98062527918.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_e90f145c4a1643a79b1ef74831f87566.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/593be9ce-0bea-4bc6-b3d4-67f87b9f15c9/uniden_loud_and_clear_flashing_light.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f5ff4c048b434789891bf9cc00be48f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/668f9e56-bbbf-4f9f-91cf-10bcdf518016/kuwugizet.pdfIn PDF document text
    • http://fegosuzix.epizy.com/do_plasma_tvs_use_electricity_when_turned_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a37deb-e9bd-437c-a47b-b07fe5ed0539/78820853363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c7bd36-7d90-4f71-99b2-3220dca84a19/xezovakefuzu.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_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 5356 bytes
SHA-256: a98e3cf8745a51a410a8fc4ab5f0e5f6bf2fc796fbec2716951bdae191610eba
font_01_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 10580 bytes
SHA-256: ec03745a21944f384995695a8414e6ebd8da3b4715bc488f25568ef427b0dcf4