Malicious PDF — malware analysis report

Static analysis result for SHA-256 c908d4d65e2f1705…

MALICIOUS

PDF

73.0 KB Created: 2020-11-22 16:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8584c817d3258bf2dbf167a1eec7b701 SHA-1: b69a97adf850f23ef2261dc700287c5d7cf1b062 SHA-256: c908d4d65e2f1705346cb341baed2b53bfdd03494a6d94422425fb2cdbe2ede3
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link and a link farm. The embedded content, though heavily obfuscated, appears to be related to product pricing, likely a lure. The numerous external URLs suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=hastens+adjustable+bed+price In PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_5faff20473331.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/pizigagedima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f91b99253740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f8f8601d0608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5fa35405e0dae.pdfIn PDF document text
    • https://jajivinejide.weebly.com/uploads/1/3/4/3/134354145/d2f3a0d4ae23254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fa98610373fb.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/8661809.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/aprilaire_humidifier_model_600_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/59889695952.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/84590303141.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_off0000e0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DA 5244 bytes
SHA-256: c750d72aa1c779d58df04c43b78c61fe363b643c23848ab954510aaaf00a5791
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10880 bytes
SHA-256: 662a9735ba033f0e8db38fa3ec2b30c3b11e8d8d834bf234ab176e7b8c1c1e71

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