Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cef0d0200de086…

MALICIOUS

PDF

80.3 KB Created: 2021-05-01 17:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e24c72490df8edf926d26a3c77fa0b25 SHA-1: 33ff839baeaf5a1410dc528c13ab78fcdae6d481 SHA-256: 11cef0d0200de0863b83b34d152f65a3757530c1f23eee0b3c51d47452227ebd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://seumenha.ru/strik?utm_term=asian+gypsy+moth+habitat. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=asian+gypsy+moth+habitat PDF link annotation
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/1224724.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/jejafinefoxos.pdfIn PDF document text
    • http://naxawibumeso.iblogger.org/swat_sniper_army_mission_apk.pdfIn PDF document text
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/48745.pdfIn PDF document text
    • https://rirupalolidofe.weebly.com/uploads/1/3/4/6/134601765/mofigepotof-wuguzaful-jinajamezoru.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/0629c8890.pdfIn PDF document text
    • https://limopepubev.weebly.com/uploads/1/3/4/6/134627214/6725827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421209/normal_5ffe610f176eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_60570176625e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_600dabed3de85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_6043f425b8a88.pdfIn PDF document text
    • http://fusitekive.iblogger.org/dibadevisexazamuj.pdfIn PDF document text
    • http://xamurewezoviw.iblogger.org/10422324000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_6047371accc43.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://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_8033e14f63bf4a7aa914c4b26bd026c8.pdf?index=trueIn PDF document text
    • http://ratosore.epizy.com/mugabuzo.pdfIn PDF document text
    • http://tevovineluf.rf.gd/autocad_free_online_course_in_urdu.pdfIn PDF document text
    • http://rinonefor.rf.gd/picsart_apk_mod_free.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_446fb40a19db46aa9d16a781624e1e40.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_5cdef598d1664730a78d9ef0c028aba3.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_7d1a213026544ce7a2bac26abb506473.pdf?index=trueIn PDF document text
    • http://dofurorumilu.epizy.com/newetirogagokem.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_fe508d65b6a04c5cb5a66160574ba3e5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 5004 bytes
SHA-256: 74140a7993b7d2e20bd0e425d74f1c659e1161fda4729e6b13821c02e52bc1f2
font_01_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 10440 bytes
SHA-256: 82646cfeacf255d9443b510b11107af303cd2022aed0be2139dde8700392450e
font_02_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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