Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b627867243498f7…

MALICIOUS

PDF

73.3 KB Created: 2021-03-16 01:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1b873fb6c1e97a3be902e2a5044c695a SHA-1: 5c02ad55aae8295476af63bffd097cf015d227d2 SHA-256: 5b627867243498f7fd1fb0ba2432f727d86fdf9c98e9b114b0d93095f88bcbc3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://lozipotod.ru/wix?keyword=rev+transcription+test+answers+2020+pdf PDF link annotation
    • http://linavaluviriv.getenjoyment.net/will_there_be_a_freed_book_as_told_by_christian_grey.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/ijifye8/penijogiravomabajojimax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_604ce6f76d12e.pdfIn PDF document text
    • https://cdn.sqhk.co/kubibosujiko/fT0Tgja/84402990889.pdfIn PDF document text
    • http://bajesiradevo.getenjoyment.net/93291744160.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/96832750796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_6036500e51701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_5fd76dc4c7c9e.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/zewiwulejolaniba.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/diet_plan_to_lose_weight_and_tone_up.pdfIn PDF document text
    • https://cdn.sqhk.co/lowovegoxoji/gDgx0fh/rikidagonuvebaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_601e0ac625a4f.pdfIn PDF document text
    • https://cdn.sqhk.co/xukonobos/igFYQja/78910265541.pdfIn PDF document text
    • http://mufawajidoxe.22web.org/free_bootstrap_blogger_templates.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidiwafupilisu.rf.gd/dieta_cetognica_cclica.pdfIn PDF document text
    • http://pekuruzaxi.epizy.com/14245315947.pdfIn PDF document text
    • http://kirawolus.rf.gd/83199783431.pdfIn PDF document text
    • http://wimakidumivupa.epizy.com/zuxedewanofoxifi.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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 5548 bytes
SHA-256: c5d7b32a5803c5a9fd6f8e605fa7eddfda63338f54105989d69b87db3a527c3f
font_01_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 11408 bytes
SHA-256: ab32135bf41b2af392924dad28e0216904b4e6592834d820aec2a47baeec9021

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