Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ed54bfb4f0b46…

MALICIOUS

PDF

74.3 KB Created: 2021-02-27 10:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 36b3bdf687b45e5d0d6a8baa95c82f88 SHA-1: dcf2a3fb9a7478594e54a4dec23ff411fa78f936 SHA-256: 626ed54bfb4f0b46a82047e39e8f2e89e986fef13e2a2430b74dff47ac213c23
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to distribute further payloads. The document body, though heavily obfuscated, appears to be a lure related to academic topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/strik?utm_term=list+of+topics+for+paragraph+writing+for+grade+5 PDF link annotation
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/turas.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/birinevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5ff8abb1a89d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_600b6a90f2736.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/aQidwn8/bunikenitoxodumur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_601cd7bf32260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_6020c6fa03be2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_60216d8631408.pdfIn PDF document text
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/bcef876c066213c.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/gjihVe2/adventure_island_gba_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/gSiiNgh/85390709358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_6024c20122385.pdfIn PDF document text
    • https://vuxizufekek.weebly.com/uploads/1/3/4/8/134864169/1971314.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/fdiczZ7/azamara_journey_refurbishment_2016.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/13089410129.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/bypass_google_account_lg_g5_android_7.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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 5540 bytes
SHA-256: 5a4f95713b041b731bed34f8f4d4e48e94c1b8c442caae8fd4257087e5d4d138
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10816 bytes
SHA-256: 5a8ce59cf36cda7dacab323d16a89b08f2d7f870e407270d9d105d1d0e776e31

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