Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3064eb700c9b18…

MALICIOUS

PDF

68.7 KB Created: 2020-12-15 20:31:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa428de79f3bba58534fcd8800f3a887 SHA-1: 7520e5035f72922559fe57233602763d719e1b9b SHA-256: 0c3064eb700c9b18eb08221f0c7b04ff6140ab68e820c68cfa57d1f5f8969baa
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure at 'traffmen.ru'. The document body is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking the malicious links. No scripts were extracted, but the presence of multiple links to potentially disposable hosting services suggests a link farm designed for traffic redirection.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffmen.ru/strik?utm_term=craft+moves+in+writing
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5fc38d151b1d5.pdf
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/0068069e6ddbb.pdf
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/momiletivi.pdf
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5f8a075a9f833.pdf
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/2f6e50f.pdf
    • https://guxikotazo.weebly.com/uploads/1/3/4/7/134704652/d1d904c349a.pdf
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fa98ac53b556.pdf
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fce313eccce0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e0f3f7cf8c75402ad020/t/5fc1dadf3c02f22b9d512049/1606540000086/nationalism_in_india_worksheet.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0424a97599144ebe4182/1606288425197/josefogaba.pdf
    • https://s3.amazonaws.com/geradi/android_in_app_billing_cancel_subscription.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/endocarditis_guidelines_aha_2015.pdf
    • https://static1.squarespace.com/static/5fc140152cf09257bd6e62db/t/5fc5b2e9fa04221c71e52b40/1606791915000/15888299622.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/pilitovut.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_off0000d04e.bin
be520698afaec84aab02f83594faf3b8c94514fc24c4916e849714fbb54cd4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 5112 bytes
font_01_sfnt_off0000e1af.bin
ad81fbe349949f35ecbd1ae67465323c8b5998098b41c008a1b8de08980939a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10872 bytes

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