Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac08e3b80e1dec08…

MALICIOUS

PDF

68.6 KB Created: 2021-01-05 19:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de322f371b04df453bd2d22893e87b32 SHA-1: 766eef8a020415f79f3f2999d8bc05f544420443 SHA-256: ac08e3b80e1dec085ae7d48ce8f8319f186480606d47d4b828534b53d5e61365
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as a phishing trojan. The embedded URLs and the document's structure are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/aws?utm_term=cambridge+ielts+2+listening+test+4+answers
    • https://cdn.sqhk.co/bifugudawesu/Y8gieih/exogenous_infection_bacteria.pdf
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/3048823.pdf
    • https://cdn.sqhk.co/xiwapusumoge/ifhuASK/modern_warfare_3_weapon_list.pdf
    • https://cdn.sqhk.co/kepebeso/emibVig/bugufudenupiwokapinip.pdf
    • https://folejate.weebly.com/uploads/1/3/4/9/134902611/4da557.pdf
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/zuvefusu_tewojawowebav.pdf
    • https://cdn.sqhk.co/sezogitov/hjW3hfF/bubetizireke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wesezuzuvalirik/clion_platformio_plugin.pdf
    • https://s3.amazonaws.com/voropa/98603827883.pdf
    • https://s3.amazonaws.com/sojebelevenex/mapudipazumifopusofodu.pdf
    • https://youtu.be/ihi3hKeKXX4
    • 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_off0000ce30.bin
b4b2a1dc48d8880bb1c2f3a383080678fe37deffcea9897d11c0fbf198fb84ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 5504 bytes
font_01_sfnt_off0000e0dd.bin
ce4c96c191c1ac9dd2b2d66311be10d97b0116a19b8e2778d09dee159d6bbd7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 10900 bytes

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