Malicious PDF — malware analysis report

Static analysis result for SHA-256 a652eb75997e53e1…

MALICIOUS

PDF

101.3 KB Created: 2021-03-02 18:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3235adee1966e71a03c165ce2fb66289 SHA-1: 4ccf7288ed33c466ab41e03a1b424cacbc4c0763 SHA-256: a652eb75997e53e1e87b382e830114f35fe4db02b078d3b2493cf74c1e6bb0b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=just+2+words+level+1093 PDF link annotation
    • http://rawoxaxevog.mygamesonline.org/buniwekugi.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/3071491642.pdfIn PDF document text
    • http://guxesux.22web.org/69075042784.pdfIn PDF document text
    • http://somirolixikaf.iblogger.org/report_minor_accident_dubai_app.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/self_introduction_in_interview_format.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/nuvukuvex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_6039529d2d6d5.pdfIn PDF document text
    • http://lefuduzitenazig.22web.org/phenol_chloroform_bacterial_dna_extraction_protocol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_5fcdd2396265e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wakafovoda.epizy.com/benedasapatapib.pdfIn PDF document text
    • http://fapujeg.epizy.com/free_business_card_template_for_mac_pages.pdfIn PDF document text
    • http://temefolix.epizy.com/gimafafufu.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_off00014e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4D 5396 bytes
SHA-256: cfd4338d83de77084a7a6ae12cf23ae048c444b8e91ba6f6b3925e77065f069b
font_01_sfnt_off000160d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D7 11756 bytes
SHA-256: b48135a4e673d3e2f6f0ae40cdedd48328d47284890984d9566c5e804bc2fcc4

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