Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbec150d9c5a945…

MALICIOUS

PDF

107.6 KB Created: 2021-03-10 05:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 58bac3023d8764e614b57678ab86df9c SHA-1: 9b3933f9fedfe1a835fe2ff8243123c7eb22b9d4 SHA-256: 7bbec150d9c5a94571c3311ba66cde04a4fbb3d27e3b3a490a929e2bcf952ff5
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL 'https://xajibur.ru/strik?utm_term=the+sale+of+a+lifetime' is a primary indicator of the lure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=the+sale+of+a+lifetime PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369915/normal_5ff22da710891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473622/normal_6032c1fdea32d.pdfIn PDF document text
    • http://sumomubidisuwo.iblogger.org/live_hd_screensaver_free.pdfIn PDF document text
    • http://foxinawolukomat.iblogger.org/bekixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5fcedcaab67cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5ff78e67902ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_603e7ffee8f28.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/80dd587a-ccd6-493b-9572-d2d2b6541a46/fejugeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7eb525-a524-4e86-8223-343836964b93/touching_spirit_bear_book_movie.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_fe3449de2ea540038b2755eefea72593.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/100dcf88-f6da-4753-be93-ab833f2a9a34/11207117028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2509117-6eaa-40aa-a298-b152ccc43d6a/63767710292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6b568e-682f-4fa7-b9b9-1b42d1da61e5/fibinujezulolusa.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_14123f1672b34554bcbf64ddebe59fcf.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_329ac56b538c4381a87240446d6e00f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f423f0a-528e-4e49-9df5-f07672795f31/80520522690.pdfIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_722ced48e0394d1e9ce01dd573b9d72d.pdf?index=trueIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_bc558a6214a94343817ee1db5b225655.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0aec5a-491d-4057-bd49-a6c68338b37b/81373447686.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_off0001685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685A 4860 bytes
SHA-256: 763d36c4d7d05d9d28a2b9e8231a83f21c44b9eac310a7cccb8e8a85b2b3d787
font_01_sfnt_off000178be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178BE 12024 bytes
SHA-256: f1b9b33dfa67f6662f61b8c37d65edecc4ac59b212ee2e1a88ca9c515e87b8c2