Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62f140059f8242e…

MALICIOUS

PDF

68.5 KB Created: 2021-03-10 20:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 025fb52c6824e1caf810c1d3264bdcc2 SHA-1: d244c745531a30a243057e0c293ff687bb8441e3 SHA-256: e62f140059f8242e384d2863c86b587eeb060226e070a4882e6bf67b1bcdc931
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'jumiwimov.ru' and disguised with a keyword related to an English vocabulary book. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://jumiwimov.ru/award?keyword=english+vocabulary+in+use+advanced+third+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407804/normal_6046dddbc1a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fd7608124a17.pdfIn PDF document text
    • http://libralab.digital/83410789565x5juo.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuzorumuji/ijAx69g/34804850940.pdfIn PDF document text
    • http://starconflict-game.ru/93194232139fh5yd.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/gyhihih/alien_apocalypse_movies_on_netflix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5fded590c0718.pdfIn PDF document text
    • https://cdn.sqhk.co/goxejake/vhbAb5H/standard_enthalpy_of_formation_questions_and_answers.pdfIn PDF document text
    • http://magnifioco.site/dapibibojiluseronarasjah4g.pdfIn PDF document text
    • http://thedefenseforge.com/acoustic_guitar_lessons_online_free32jws.pdfIn PDF document text
    • http://myimperfectmomlife.com/yanni_nightingale_sheet_musict11ns.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/VhfZ7hh/movie_quotes_funny_disney.pdfIn PDF document text
    • http://osmosiotzs.fun/hungry_shark_evolution_dinheiro_infinito_apkw0wwv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/49209120634.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/sample_email_format_for_sending_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/17478288750.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/verbos_irregulares_en_ingles_del_pasado_simple.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_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 5676 bytes
SHA-256: be5c82bcffd3a3ceb9dcec14bb03779da479f6a7f5a7f952e8fe600bbfb885a9
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 10116 bytes
SHA-256: a812427b25ef695a61b174227b443b0d96f315ef1a5d9ae52021c81c8020b98d

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