Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dffe769908b011e…

MALICIOUS

PDF

72.1 KB Created: 2020-12-19 11:04:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 625d48bb439b625c71f9b2bd83440556 SHA-1: 6a4afdddd17c9ae59c3e3b7684d4f5fa63f9b211 SHA-256: 4dffe769908b011ec20157938c180f3ee805c64df8f62595e87584bc562b7e71
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://trafffi.ru/strik?utm_term=frankenstein+study+guide+questions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f990d49de7ff.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/4309230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5fa1eb573cae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477651/normal_5fa740da0c0bd.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/nitedosoponug_mowazene.pdfIn PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/291cce8a9e0bea.pdfIn PDF document text
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/07a0c052c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f8ea96602ce7.pdfIn PDF document text
    • https://tadodilupusoje.weebly.com/uploads/1/3/4/7/134702012/bukafulibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe33673c02f22b9dd82e4c/1606300523511/invisible_man_quotes_explained.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc729495f0d731e16aabfad/t/5fca1584822fbd3263e5a76f/1607079301644/bamotupokuwexe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aeb49955c744b55c0b00/t/5fc6502beaf37e3b6472ff0e/1606832171353/mcdonald_s_application_near_me_part_time.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28bf30a2757459bed6a63/t/5fd0b6a3ab2d482295e4b400/1607513763225/86700108742.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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 5300 bytes
SHA-256: bf9da59871a3080c6fb71e260e211752e096a1d5c9cfedfb8725a004c60fbf25
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 10440 bytes
SHA-256: 15131bd471de43c965b1724889fddb607058b52cf3413d1f45e6df8985482ff2

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