Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e3cf1246e199bb…

MALICIOUS

PDF

94.2 KB Created: 2021-02-19 14:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fa7d585d106c92cbc60efba87e8e5ca6 SHA-1: d4947ecaef665a5115fd52c5d9a3d0161c98a546 SHA-256: c1e3cf1246e199bba328be94adb4ab6902ce18fc57963cb3cab1fdb7273daca2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the heuristic firings suggest the document's primary purpose is to redirect users to potentially harmful external sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=what+is+the+moral+of+the+fox+and+the+crow+story PDF link annotation
    • https://cdn.sqhk.co/bopelara/SABgegj/offline_gps_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/ifjeKLE/magekekeririkexax.pdfIn PDF document text
    • https://mixizuvas.weebly.com/uploads/1/3/5/3/135383824/9336089.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/cuDWohb/sing_karaoke_app_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_601d8043af5d0.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/2656132.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/jhhb1km/minigames_minecraft_ps4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477655/normal_60066c37ab3dd.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ibgjii3/mac_word_dictation_not_working.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/4abd943829dc1b.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/ihejbeD/61084042620.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/Egf8Lii/73452436069.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kudefem/tibuxidozuvux.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/competition_law_reform_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/31354233535.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/crown_chakra_guided_meditation.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/kisopuporamekuse.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/microsoft_word_mcq_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 5324 bytes
SHA-256: 098e02203097e5996b7c86120b940c494a2c8ae471b8515cfa4916bc2dabaa1e
font_01_sfnt_off000131b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B4 14380 bytes
SHA-256: f10aa5facd072ad565a73335c6b54389c631291b9b8d3178a968409b3170b1d9
font_02_sfnt_off00015cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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