Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b89e5db7f53e9a1…

MALICIOUS

PDF

79.9 KB Created: 2020-12-01 16:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34dd92b034a9d3d2df8e42ebcd20a4dd SHA-1: 1ee6e7119aaa352f789e6022d13dd6455a863332 SHA-256: 9b89e5db7f53e9a1c64cd1b6af8e1c3111ae90f1b8fe0da8942f334770cf9b54
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary goal appears to be directing users to potentially harmful websites through a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=len+lye+sculpture
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/76fcb1a7d3f917.pdf
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/7070073.pdf
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5f9dcf473ee14.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8dde04c437d.pdf
    • https://duxepanakotijek.weebly.com/uploads/1/3/4/3/134340233/8611223.pdf
    • https://notokawuwo.weebly.com/uploads/1/3/4/8/134856920/9001447.pdf
    • https://tobopitoru.weebly.com/uploads/1/3/4/8/134872655/kabetixifetu.pdf
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/2074507.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/9732b2a6-210a-4d94-8e0d-ce0fa07bdcc7/web_design_book.pdf
    • https://uploads.strikinglycdn.com/files/3084d9e6-57c0-4703-b75b-e73784f96ce6/pinay_scandal_download.pdf
    • https://s3.amazonaws.com/pazifetanegapu/nanokalujef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin
6d5f8730827a2fa764953ed8ea221ab45ed85dd143f312263d01b343380e7438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 4484 bytes
font_01_sfnt_off0000fcfe.bin
4b3060f5feb51f9804cbc6bc27316c00421f8f092e4cfda34b2ccf2869e72726		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 11988 bytes
font_02_sfnt_off000124f1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 4324 bytes

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