Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f90d51b7a22685…

MALICIOUS

PDF

73.3 KB Created: 2020-12-24 11:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a2b6e15d6adc45caafd51b6354b24f SHA-1: 11b4c589b6f9df9291000db695a0bcc925c666d5 SHA-256: 08f90d51b7a226856adedb6cbe1b3bde280ae9ed57bba0eace93a25fc2a23b31
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely serve as lures to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/strik?utm_term=covenant+umc+plainfield+nj
    • https://lomojibopizan.weebly.com/uploads/1/3/4/8/134886372/jagowobesireran.pdf
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/117871.pdf
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/8517800.pdf
    • https://tivagojeno.weebly.com/uploads/1/3/4/7/134714391/tasusemozawi_xowasokutodem.pdf
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/5035446.pdf
    • https://sipelebe.weebly.com/uploads/1/3/4/3/134312525/zavomoz.pdf
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/zuden.pdf
    • https://kijadixuzot.weebly.com/uploads/1/3/4/5/134585523/tobaritoduf_bitezabolisilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/datarofapakil/61570211546.pdf
    • https://s3.amazonaws.com/joterige/bonds_baby_size_guide_australia.pdf
    • https://uploads.strikinglycdn.com/files/00f93bc5-6007-4e64-9713-7046bcf29f04/89799803683.pdf
    • https://uploads.strikinglycdn.com/files/555931ac-23ef-4aa4-95a9-a47323021977/kewixi.pdf
    • https://s3.amazonaws.com/gapivegek/traveling_at_high_speeds_requires.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_off0000e39e.bin
2b2b70d5151f7722406ba09d70c432a7ebea9efc62ae57ca9e5aa982ccbba11b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 5068 bytes
font_01_sfnt_off0000f4e0.bin
865922a090e81571f8365dbba4577290d1834716cbfda76aaefdcc1c6d638869		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10448 bytes

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