Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fc5de8566ece45…

MALICIOUS

PDF

86.2 KB Created: 2021-05-30 19:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e99f3ac287c77eca880d3155dccec687 SHA-1: b6baaab02f29fda659f4d0870b84ea3e85fe5144 SHA-256: 86fc5de8566ece4595b819c9494111653e083cdf5a14335c470ba6a91b6e2dd9
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://pelibifir.ru/123?utm_term=bloons+tower+defense+5+strategy+guide PDF link annotation
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/22ed5ff3af72.pdfIn PDF document text
    • https://vidisuxusa.weebly.com/uploads/1/3/1/6/131606291/tisonuwabanabepeje.pdfIn PDF document text
    • https://lezivefa.weebly.com/uploads/1/3/4/4/134458465/9050909.pdfIn PDF document text
    • https://zimuwinosozenuj.weebly.com/uploads/1/3/0/7/130740464/9868952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ff574ae4f516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_6046d4d28c1f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_5fea3e0b8da86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_600e10d3910b0.pdfIn PDF document text
    • https://natedutaz.weebly.com/uploads/1/3/4/8/134850225/6669829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_606146cea39db.pdfIn PDF document text
    • https://zunejekuriraruk.weebly.com/uploads/1/3/2/7/132712234/vefobiluratuv_sukax_gezufok.pdfIn PDF document text
    • https://xawimoveparuz.weebly.com/uploads/1/3/4/0/134040397/xalupexilebepop-xikonowirotik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_60251f12a23ca.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/5940795.pdfIn PDF document text
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/1478400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452169/normal_5fe8396825ccc.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/nasazetebipule.pdfIn PDF document text
    • https://gatodagimisosog.weebly.com/uploads/1/3/1/3/131379801/b47e66e7e.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/joniletizaturip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450417/normal_605ba0c2b4de0.pdfIn PDF document text
    • https://kuzigojuzomuw.weebly.com/uploads/1/3/2/6/132683135/c3441a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4a730ace-617b-42f4-b6cb-951d2378b004/cuantos_metros_cuadrados_tiene_el_estadio_monumental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cac383-2a64-441a-9bdb-822549098b02/rt-n66u_merlin_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d44eb92-1109-4d1c-b6c1-16bbaf5992b5/xajetixi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 5324 bytes
SHA-256: 9f68a838ecdd9bc1518ac2bf41aa67003cb4ce40d25c50c1293715733f4d0fef
font_01_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 10992 bytes
SHA-256: e457b032ca4d1b8f245cbd7e37cd1f379face3075def79f4cbb96f0f2bd01518
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361