Malicious PDF — malware analysis report

Static analysis result for SHA-256 613f8b3db26704f7…

MALICIOUS

PDF

63.0 KB Created: 2020-11-22 16:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fceccc9abd641d623281787796cac82e SHA-1: 09af6d53af3c97f658bb1a4ef8e2a3220da0424e SHA-256: 613f8b3db26704f757629233579fc8f31183970c408813804b7da1ad5f995f39
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting services, indicating an attempt to direct users to malicious content. The presence of a link to known malicious redirector infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://gettraff.ru/123?utm_term=oakview+middle+school+lake+orion
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/9187983.pdf
    • https://juzatimeb.weebly.com/uploads/1/3/4/6/134605854/lewewivupasez.pdf
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5fb373e03e27f.pdf
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/1433701.pdf
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5f92c87f56a8c.pdf
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/sogumon.pdf
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/4047815.pdf
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/6976157.pdf
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5f9f78895b0cf.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/melubuxam-xujewaselo-rebilinovux-debupizusi.pdf
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/foleraz.pdf
    • https://venifamu.weebly.com/uploads/1/3/4/5/134501621/judalujasowuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ba6a.bin
c66f97a9c22a1e3288d5951fe45c58a028684236286a54e8ce257ed8436845c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6A 5420 bytes
font_01_sfnt_off0000ccc2.bin
2f79a4a95b19d3d5ec5812829fcc8d8a9725eb6e2734d5fb9ef23c1ce2586495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC2 10136 bytes

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