Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b6ad4a52628f0d…

MALICIOUS

PDF

145.0 KB Created: 2021-03-29 06:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a096d9a20c4195622d4a87ab796f5e5 SHA-1: a50e411ef5b97e32ede2481e044bfc8c100acb26 SHA-256: a2b6ad4a52628f0d3498e16109d134c995cfa2dd091814ef40b9b000a3bf2624
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, designed to redirect users to various PDF files. The primary malicious URL identified is https://xezojetit.ru/award?keyword=ultrasound+gel+manufacturing+process+pdf, which appears to be part of a link farm strategy to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=ultrasound+gel+manufacturing+process+pdf PDF link annotation
    • https://cdn.sqhk.co/xamozafi/qK9sWgi/gukupi.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/vewotajufevara.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/MjbianJ/90335698266.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/vih2hhc/group_video_call_teams_free.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/djXgehj/vufofe.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/fd494e1fc16c0.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/fSY14M2/pathfinder_weapon_master_s_handbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_8a05ebacf2c046d1a296c8f3b5614cf6.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_a8412b6135a94225b2632da4440ec2b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bd105f-1e53-4ebd-b84a-b91ddcb7025c/why_does_my_wahl_clipper_not_cut.pdfIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_5fe93e5d8f644a029c6f2c341a873057.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce15de30-dd3d-4612-8860-ffde6eb18409/zitudisokabonon.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/vowedusawu.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_74b4aba56d2e4c12b197d785d4961d67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fcfc6a-08b4-4ace-8828-3b597ddfec20/map_of_fgcu.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/profilaxia_endocardite_bacteriana_guidelines_2018.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_off0001fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE84 5468 bytes
SHA-256: c52046d8fadb68c7285dd1841aa2a21643a12c57da36740b9b5373d857a6764b
font_01_sfnt_off0002110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2110D 11124 bytes
SHA-256: aac2af14b9dda0b878caf482a872971ebbeba066670e3f95c880ccdb12ebbda8

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