Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa87be02f8050d…

MALICIOUS

PDF

70.6 KB Created: 2021-06-11 02:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52e43769a9347ea76441a2ccf40c99d8 SHA-1: 862c0d42b524f4449e0cd6fed2858afe938a1439 SHA-256: 66fa87be02f8050d8176fb4971e5ab23a167bf4d6afd5ad76a43c439c8e4c530
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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
  • 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://irlanc.ru/pbw?utm_term=nfs+need+for+speed+most+wanted+download PDF link annotation
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/tawuxopufek.pdfIn PDF document text
    • https://woliwaluv.weebly.com/uploads/1/3/4/6/134686062/02446e74.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/7916667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_604357a186d2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472503/normal_5fdf4d47d713f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_605401c359e66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5ffc09be27ff7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_6004f40017109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevukimugo.pbworks.com/f/14355733582.pdfIn PDF document text
    • http://lebunurivugu.pbworks.com/f/89861822840.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/f/big_ideas_math_geometry_chapter_10_test_answer_key.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/59710987570.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144454146/54813349008.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/144471810/niwurilovonosadewakoge.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/w/file/fetch/144674883/22228402399.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/29627973410.pdfIn PDF document text
    • http://pilujibos.pbworks.com/f/73116575005.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/w/file/fetch/144535809/captain_america_full_movie_hindi_filmyzilla.pdfIn PDF document text
    • http://puzavofan.pbworks.com/f/77978015440.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 5248 bytes
SHA-256: 3255dee918cf7df225a27bd008442fbfe58d53b98bb65d7ec882aac01355dc7d
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 10264 bytes
SHA-256: f6ef4729cab89ca56588fcd5465709d4b4952eb27223d1fa19d11217ed8d8458

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