Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc428c1e072055d…

MALICIOUS

PDF

108.5 KB Created: 2021-06-03 12:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5037793a4dd7d945b13ee28ab9b9aa1f SHA-1: e38bea17c044133ac5ff630421fb6e277a3547d8 SHA-256: 6bc428c1e072055d240571297e147d91fa4fa71a16e952698c237e34321eec7b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a 'math definition notes' document, suggesting a lure to trick users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a phishing or malicious redirection scheme.

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://drafthe.ru/pbw?utm_term=9th+class+math+definition+notes+in+urdu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5fd123b0dace3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370543/normal_5ffc0f447349e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_6044a7964abec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_601191563e26a.pdfIn PDF document text
    • https://mozufutedubido.weebly.com/uploads/1/3/4/5/134503110/zewubekibelamis.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/vubiwukozij-lilinudezowaxis-rerupe.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/6b135f.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/fajikazonavuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_605f1af46809c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9986e390-64a8-40cc-b218-e0a0439fb02c/38321690722.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/how_to_cite_two_footnotes_in_one_sentence.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144411681/how_to_mix_salt_reef_tank.pdfIn PDF document text
    • http://gexufak.pbworks.com/w/file/fetch/144555366/la_ilaha_illa_anta_subhanaka_inni_kuntu_minaz_zalimin_meaning_in_bengali.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144424218/deductive_reasoning_test_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25350766-4968-45c1-9a19-fa1c5fe4640b/zedupanas.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144423471/nejemewedagaranil.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/w/file/fetch/144552567/baby_day_out_full_movie_in_hindi_download_mp4moviez.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_off0001698b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698B 5456 bytes
SHA-256: f8dbf85581c34e5054a2fdd163756716df511673b23ca4335fe389694af86fcd
font_01_sfnt_off00017bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEC 11700 bytes
SHA-256: 1eb1496e982e2225f874c17dd7bd41f6a7f3896d8ab55317227108519790c46d

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