Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd215b0408505870…

MALICIOUS

PDF

83.3 KB Created: 2021-03-11 05:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ed04229508f099d72fae55fdcabd6872 SHA-1: 9e6153b9e4219c3d947e93741d1b076b89f9d9bc SHA-256: fd215b0408505870d8ace4c83c26c4dc67a9556e4131f8a99a8b1ffef1f62a95
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The primary URL, https://bologen.ru/award?keyword=adjective+degrees+of+comparison+exercises+pdf, is presented in a way that suggests it is a search result, likely to trick users into clicking it. ClamAV detection and ML classification strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/award?keyword=adjective+degrees+of+comparison+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386330/normal_603e6b607365a.pdfIn PDF document text
    • http://lebuvowune.getenjoyment.net/comentario_biblico_adventista_del_libro_de_romanos.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/YdVhjG9/33355259712.pdfIn PDF document text
    • https://cdn.sqhk.co/jawakagufu/hk56pEH/94333994682.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376096/normal_5fe5972968f4b.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/41735233977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6029a6eb35655.pdfIn PDF document text
    • http://sokobumoxagug.scienceontheweb.net/pugekekosofup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456143/normal_5fc8b3277caa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_601690a4178c9.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/djduhg2/gasodavi.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/my_pet_warehouse_dog_toys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_d620e6b32da545ecb0fd46e9f016739e.pdf?index=trueIn PDF document text
    • http://gopogawamo.rf.gd/99435560705.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_0b814e6ba00e45ac83eb099244445d81.pdf?index=trueIn PDF document text
    • http://pinezininefos.epizy.com/divam.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_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 5636 bytes
SHA-256: 461a7c88bf003bd1d79ee2bf70ab3fb43da7f91582abd019a966064f3030f02d
font_01_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 10292 bytes
SHA-256: 3d39538127e524d3442c72e76c8b4af8c349ac32d6b02ba0c0b7726e5de5eeda

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