Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f267cc1d684938…

MALICIOUS

PDF

72.2 KB Created: 2020-11-16 16:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 79bba162cdc043b26be5398b71f3e145 SHA-1: 966ecd82ffc0ec6328406e8088934158decab4a5 SHA-256: e1f267cc1d68493885484bfbe1934657b477dbe30d7cb3dd0b34633b3e040c6d
186 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 0.9997

Heuristics 6

  • 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.
  • 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://trafftec.ru/123?utm_term=rome+free+academy+stadium PDF link annotation
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/nutadesosepirilifin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5f9b574dd0484.pdfIn PDF document text
    • https://dosijarirolid.weebly.com/uploads/1/3/4/6/134668623/2372938.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/7040516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5f9379061454c.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/4957355.pdfIn PDF document text
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/sibapobe-zesewozu-wedov.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/dd4727d2-4331-4eac-9253-1118fd52a76c/39824711392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddaac30-c510-4992-973d-e44192f52936/dropbox_direct_download_link_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319fbc99-4697-4bc6-90bf-7ccb014700a8/sudijokotuxotenalenebeliz.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/11319327405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce20865a-b1c6-4b57-803c-dbdabdf21035/by_the_great_horn_spoon_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f2d2d29-69e7-4565-ab0c-5398bc190454/71319746645.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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 5244 bytes
SHA-256: 372e28f01887a7dda2fe0c81e3a86d08ad0259011a7ad5c31acf50648c773a0a
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 16672 bytes
SHA-256: cf397b4cb3444bdbdcc1e6ffcb798b20478d01e03b0a04e5cfe8bed0c9352df6

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