Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e559617aa5ff73…

MALICIOUS

PDF

75.6 KB Created: 2020-11-25 15:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1d66dbb02b21ddd25d672ba155e7f6a1 SHA-1: 96da10d4b5e46e881493d2e3a84ee5bae7fe066e SHA-256: 24e559617aa5ff733293503f314fbaddf4907328d8cd302c8205996315f010b3
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://traffine.ru/strik?utm_term=bloons+td+5+tips PDF link annotation
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/6948538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_5fa93ba556c5a.pdfIn PDF document text
    • https://pevumufaropis.weebly.com/uploads/1/3/4/7/134706438/6e9794fc5497bb.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/tufetanimusaseweg.pdfIn PDF document text
    • https://xawalovu.weebly.com/uploads/1/3/4/6/134652108/povimesafifu-sutovili-virubunefijebi.pdfIn PDF document text
    • https://mupaxeruzu.weebly.com/uploads/1/3/4/5/134597089/64966aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5f9747d677d03.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/tabobujimo/a_thousand_years_ukulele_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/fimajovixegifasibefaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c6bd60-95f4-4683-aa48-d6b1bcd717f9/44367702020.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/ms_cooper_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/combat_sentinel_guide_swtor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1546bfd5-07ff-4ccc-9e15-c06a4b371e6f/mission_impossible_rogue_nation_free_download.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 4820 bytes
SHA-256: e264b735805298c643676c3e4144c3f50d2c3985d66973e111adc326176dc4ea
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 10704 bytes
SHA-256: dc1984ece993b4736517cc1259371f53b752189675fa3e1f42e4fe36f33ad369

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