Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b3d7b067ce52bd…

MALICIOUS

PDF

91.5 KB Created: 2021-06-02 11:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 41d0697ee349a308f3435c8e2fa3a63b SHA-1: 0205d71ca4a94e841cb9987fad8235856fc10640 SHA-256: 69b3d7b067ce52bda25ff383fdc2dc9e14f555cfb29317779419fb2499807420
186 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to practice exams, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=free+mta+bus+operator+practice+exam PDF link annotation
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/b45da.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/8392110.pdfIn PDF document text
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/ee70e6b2.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/kulukewisew.pdfIn PDF document text
    • https://lonunupamazukev.weebly.com/uploads/1/3/4/7/134711915/de2d362db41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5fc9be15972dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_602c1f87504e3.pdfIn PDF document text
    • https://sosegasum.weebly.com/uploads/1/3/1/4/131437139/1670093.pdfIn PDF document text
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/63e34cd0dcdf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478716/normal_60b40b4d5565a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_606b351244a70.pdfIn PDF document text
    • https://buvebozu.weebly.com/uploads/1/3/1/4/131453495/7173753.pdfIn PDF document text
    • https://veledagovivavav.weebly.com/uploads/1/3/2/6/132681602/11345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_6009b4a803f34.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/115d995a-44c9-440e-ba09-d783214cbdd2/holt_french_3_cahier_dactivites_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3ae1a6-816b-48f1-aa58-890f922ad0c3/samsung_smart_tv_universal_remote_codes.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144499422/1982_honda_nighthawk_450_carb_rebuild_kit.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/organization_theory_and_design_3rd_canadian_edition_free.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/modeling_exponential_growth_and_decay_worksheet_answers.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_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 5212 bytes
SHA-256: e95c9ab5ef268ec434960c0506eb04be2b9d470f5d97f8e58d3e51bcca202452
font_01_sfnt_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 11644 bytes
SHA-256: d7a82ad912822a31995f284cbf2007ff6ee7c198da4b6e25f0c7611eb2feae19

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