Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13cdf043e5beaf2…

MALICIOUS

PDF

84.6 KB Created: 2021-03-11 15:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09e76961d36f4541cced1ae564487244 SHA-1: 524a9a60bbe8b7bfdce90b0f3b9d1d0570fd72b4 SHA-256: a13cdf043e5beaf2375633e41a88217764772e4b371c9e2ddb3d494858cb33bd
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. Heuristics indicate it's a link farm on disposable hosting, designed to lure users to malicious infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5237

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/aws?utm_term=italo+calvino+books In PDF document text
    • http://mowogaw.mypressonline.com/disha_publication_bank_po_books_free_download.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/hangout_app_for_android_phone7u2pq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462368/normal_600725052cb36.pdfIn PDF document text
    • http://a1metromovers.com/is_krav_maga_safeb0i4c.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/23790002811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_604620c98ebe6.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/better_than_before_book_download.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/xumeseruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_6026e7cecad03.pdfIn PDF document text
    • http://trikotoria.ru/35029278530y0zuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_6025881559014.pdfIn PDF document text
    • http://idealica-italiaofficial.site/kinosunudulabqq2wa.pdfIn PDF document text
    • http://slmit.space/continuity_and_differentiability_homework_answers7jmgr.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_0785354de446444ca3276640a1f997fc.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_8dccde8329704fbaa2e9e5570115811d.pdf?index=trueIn PDF document text
    • http://rorizupoduvu.epizy.com/fitinezubevim.pdfIn PDF document text
    • http://kaxinezapur.epizy.com/gadivevivorakanizelemuve.pdfIn PDF document text
    • http://voxotili.epizy.com/nimiju.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_715b8fbc1e8846bf97b1aedcd3289fe4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/goodbye_to_goodbye_sinopsis.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_c1d5850671d24605af92b4dd7d158c2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifiz/nivinogotoguzefade.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/fapuki.pdfIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_85e534d91a2f4256813380311d436aac.pdf?index=trueIn PDF document text

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