Malicious PDF — malware analysis report

Static analysis result for SHA-256 304f6155be1cf9b5…

MALICIOUS

PDF

88.4 KB Created: 2020-11-30 12:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5535f7ca028c6b9aeba0199adc5a9c SHA-1: 56c2e1af2d6c0f5810065999be2a860e86126315 SHA-256: 304f6155be1cf9b5b7bcee504be6602802e5b717a42f13ee69d809ff0eb01133
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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/aws?utm_term=brent+faiyaz+sonder+album
    • https://fimuxexepal.weebly.com/uploads/1/3/4/6/134615427/eb290411.pdf
    • https://cdn-cms.f-static.net/uploads/4477892/normal_5fb41b519ac9f.pdf
    • https://tufelovewojamex.weebly.com/uploads/1/3/4/3/134331554/tesarubu_jarawekojejis.pdf
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/bamanakefaw_fufuniwelokur.pdf
    • https://gitonuzulikune.weebly.com/uploads/1/3/4/8/134885185/sorulufetameka.pdf
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/02f92ed6ec.pdf
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/xutumedame_wosux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/536e1d06-78b3-490c-b727-1674a3ccf23a/nilamuxi.pdf
    • https://uploads.strikinglycdn.com/files/9c754920-241e-4501-aea4-8a029b3db8e5/4_letter_word_with_c_as_the_3rd_letter.pdf
    • https://uploads.strikinglycdn.com/files/d9d412d8-96b0-4fde-8a4b-0be617c00f57/daniel_cassany_construir_la_escritura.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011930.bin
d3a925ea3cb21b588b0c19ba6ad0eb87db6d9073910aef677b9c3a3a46a3e4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 5396 bytes
font_01_sfnt_off00012b87.bin
9c446d7b0e851379993b46a58f6902a4b7022cdc09e1c5fbeabb963404753d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 12408 bytes

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