Malicious PDF — malware analysis report

Static analysis result for SHA-256 087b082d25be051b…

MALICIOUS

PDF

77.6 KB Created: 2020-12-30 07:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe82933c7af94c256339bd3b647b2aa SHA-1: 7db15e2836684ed1d55e680c99b31a3982729229 SHA-256: 087b082d25be051b31409a26f5e8e809e0a732d181d07c120dbc408cb30a50af
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is characteristic of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or hosting further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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/strik?utm_term=std+10+maths+chapter+3+exercise+3.+2
    • https://cdn-cms.f-static.net/uploads/4483365/normal_5fb973721f7f9.pdf
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5f97bc88a6af1.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_5f9520cde8c82.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fa08d7c5916f.pdf
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/xogotimadukipox-mojugadipi-zadagenuxeka.pdf
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/tefaxasono_vozenigiri.pdf
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejideba/najofapekosavademosado.pdf
    • https://uploads.strikinglycdn.com/files/5d90ac8e-bfd0-43bc-9f24-1bce900a331f/vawomufe.pdf
    • https://s3.amazonaws.com/gixirojozogufux/99360379875.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8df.bin
430f173a8ff0e1e7e7a0496bee06cd51ae83f717f428925224c9844784b57506
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 5976 bytes
font_01_sfnt_off0000ed14.bin
36df7117c7ef39e243e2acffd76b4a78657b22a940abbe04db5422130dd5b285
pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 11240 bytes
font_02_sfnt_off000113a6.bin
4158e146958cfa62e7e046fa2a65f33eb8906bae71a567585fa083e1397f8f76
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16336 bytes