Malicious PDF — malware analysis report

Static analysis result for SHA-256 9631bb3461f92f4c…

MALICIOUS

PDF

69.8 KB Created: 2020-12-27 23:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c3f88c3a673c1b886e3eece54a7e5d57 SHA-1: dab19371ee06cad5acce795acf29e6ba7367f3c4 SHA-256: 9631bb3461f92f4c89b40f4a0a4aac3c21f3644a1c970f7a2782d59f7ff8f924
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as 'https://traffmen.ru/123?utm_term=big+8+conference+wi+schools', are likely used to redirect users to phishing sites or download further malware. The presence of multiple PDF links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=big+8+conference+wi+schools In PDF document text
    • https://cdn.sqhk.co/tewisifupib/SPERjCw/93316557242.pdfIn PDF document text
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/wamolusumafojukawa.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/igjfhaz/xujemuwugivokafobedafu.pdfIn PDF document text
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/9328361.pdfIn PDF document text
    • https://tilejawerez.weebly.com/uploads/1/3/4/7/134709016/d7e4bf731e9.pdfIn PDF document text
    • https://duxebiforup.weebly.com/uploads/1/3/4/0/134013009/eab00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fbdb9fce7019.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/valewipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_5fb8c7032c30a.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/6337995.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/megogerurinixuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5268 bytes
SHA-256: 14facb041d2c97965e8522988a4dbff967e87320ec0708c5d4bb68946ad68716
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 9988 bytes
SHA-256: 32cd4e8de25ff0e71f35b551d2bae5d844a5be5c4c3c9f19dd07ebb18fc00204

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