Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9eecbf68430ad49…

MALICIOUS

PDF

77.2 KB Created: 2020-12-26 18:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fc31f4c8dcb62c6cce2c85722adde4a SHA-1: 18d94df2f380e8c20bf11f39eee2c2585849d4e9 SHA-256: f9eecbf68430ad4984a3e0dfe6c7cc3c700635338600ee5e75f9b486eb8d86b5
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafficel.ru/strik?utm_term=holley+super+sniper+stealth+4500', suggests a potential phishing or malicious redirection attempt. The presence of multiple Weebly-hosted PDF links further supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=holley+super+sniper+stealth+4500
    • https://xuxomesepek.weebly.com/uploads/1/3/4/6/134681539/milafubonorozumuj.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/3239729.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/2809374.pdf
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/4869970.pdf
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/ripinoj.pdf
    • https://vasedowazapen.weebly.com/uploads/1/3/4/3/134320052/wodifuzeme-werurazotexi.pdf
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/4064339.pdf
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/9079520.pdf
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/3fd18471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/warapagefasovi/nirojenilene.pdf
    • https://uploads.strikinglycdn.com/files/2236bbba-40f1-4bfa-81ee-bb97a54150a5/susisomotunuk.pdf
    • https://uploads.strikinglycdn.com/files/41de4721-3a43-4625-b1fb-4ed43b4ec33a/92897123595.pdf
    • https://s3.amazonaws.com/zategafozasiru/8103551207.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_off0000f29a.bin
339da3cce537859ca40a83a7c7cb194fcf9e44b4b4a488bc993e2a530c800eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 5324 bytes
font_01_sfnt_off000104bb.bin
aa93eaa353ee5f85d9db5771ddf4dfd596b59a3379bdcc0c58ae9f272a2914b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 10352 bytes

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