Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1908d99486a5ac…

MALICIOUS

PDF

58.8 KB Created: 2020-11-19 06:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2ddf0772914f9e5a59d797b38feeec43 SHA-1: 14c99e29427c4784b1ee8ad9e68f5c289c54d7da SHA-256: cf1908d99486a5acd9f5f37f84bb58dee95a199d2efb81f34f6c1cc83b4ef596
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 0.9995

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://traffset.ru/123?utm_term=2019+and+2020+school+calendar+st+lucie+county PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f86f9722771d.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/9838750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_5fad9c8234883.pdfIn PDF document text
    • https://gufubavofunopi.weebly.com/uploads/1/3/4/7/134704705/lijirixumi.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/5986851.pdfIn PDF document text
    • https://komulobuzol.weebly.com/uploads/1/3/4/6/134618259/liwafaveno-buvarom.pdfIn PDF document text
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/730415.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/7bbd9164-9c6a-466c-8c2f-0c5246c96520/xasotila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4069218-1ef9-468f-8714-525966f545c0/tigomixiguja.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/dodgers_vs_braves_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab28c4e-6129-4129-8a36-b6958c2490ed/jeperuxajidulon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94727965-f961-4c60-95b3-07c5dc4de964/skyrim_ps3_character_creation_guide.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_off0000aa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA67 5516 bytes
SHA-256: 31d4a1815d19be86d7df948b4382496b09b3820272d7e76a79f4f75510f57a87
font_01_sfnt_off0000bd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD26 9916 bytes
SHA-256: 3257ac18813f3fdd7ad7130cd92df3e50846848b5119883f04fe47dc5386613a

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