Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85473864309f960…

MALICIOUS

PDF

65.2 KB Created: 2020-12-23 09:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b26a234b1b3c4daab09be8276d21ac SHA-1: 769f604d1291f97cf8611622ce09e6ce7a6e563d SHA-256: f85473864309f960a9e91fcdf6f0792ee723612117b41d9f7c8cf8716e530a4a
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with at least one identified as a malicious redirector and others forming a link farm, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=total+views+counter+youtube
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/pasagexawiwele-niripul-ralitivudikegi.pdf
    • https://cdn-cms.f-static.net/uploads/4485695/normal_5fba72c05354e.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/8120506.pdf
    • https://cdn-cms.f-static.net/uploads/4404123/normal_5f93677309e00.pdf
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/3093906.pdf
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/devajesixibug-woleranev.pdf
    • https://zodovamerevi.weebly.com/uploads/1/3/4/3/134316438/3798991.pdf
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5fb9437ab4998.pdf
    • https://cdn-cms.f-static.net/uploads/4426551/normal_5fbf580be2439.pdf
    • https://panenojaro.weebly.com/uploads/1/3/4/4/134482399/pipubimafakiworirex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3792a9ce-bce3-4037-a4b3-4b4960fc2a05/hobo_game_unblocked.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_off0000c287.bin
99d0623b6713e4a2ebab348676b45c03e5ad7cb08287afa4d45e7c1a691efc32
pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 5136 bytes
font_01_sfnt_off0000d42a.bin
f99fdc672cbfd711e173f4783a0b13e716ab9eed4b798f838b430604d8ba7d80
pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10488 bytes