Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad2f8617563ea59…

MALICIOUS

PDF

84.0 KB Created: 2021-03-30 22:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 91901ff3103cd498786855c7bf234fd0 SHA-1: 52a1abe062d4871b5e10db3553f606e1f72e899a SHA-256: 4ad2f8617563ea5979d28aa21ba122d31dccef851f9953b62788c8c0e0e120ed
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=learn+how+to+fight+hand+to+hand+combat PDF link annotation
    • http://bella24.xyz/zajubuniduvezln47y.pdfIn PDF document text
    • http://mon-compte-cmb.best/15443154422jfr9d.pdfIn PDF document text
    • http://discount50it.pro/percy_jackson_and_the_olympians_movicrqzs.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/4868329597n14fx.pdfIn PDF document text
    • http://goossyy.online/comptia_a_practice_test_answerso51qu.pdfIn PDF document text
    • http://50offshop.info/wesikusakuduteniw1dfh4.pdfIn PDF document text
    • http://amandeepsadyora.com/tunusokiroe5mll.pdfIn PDF document text
    • http://ig-socialmedia.xyz/54128160884obama.pdfIn PDF document text
    • http://cookwellbakewell.com/koxinopivy6opq.pdfIn PDF document text
    • http://electorat.org/wewotilejalheggt.pdfIn PDF document text
    • http://liketsven.xyz/2020_kerala_calendarkjiue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_27da28c66d4d4f1e9e2f87ab1489fcab.pdf?index=trueIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_ce794bbda5c44629a673fcdb6a2fb990.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_9bbf3e1a7df24715bb45d378178c995b.pdf?index=trueIn PDF document text
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_b0878c2163c84a769764a2224d9c2f46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/57282755905.pdfIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_f006ce4d16984af49100d57d2b08ca95.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_b56fb72c991c41fca9063f6af1940f43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/kitchenaid_matte_luxe_artisan_ksm160_stand_mixer_blue_velvet.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/gunidemule.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_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 5400 bytes
SHA-256: c9c6ab9fee89aaaea1412eb585f80fc418631ae4d30f3203a0751066b02ab8da
font_01_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 10668 bytes
SHA-256: ed265180fa295cafa2d4b940be9ecf05d5eecf39f018c3a4fe4e01094586d174

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