Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37827b72ad07efc…

MALICIOUS

PDF

71.5 KB Created: 2020-12-26 06:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d85ba3dc305ffbc61a3ff790499f3a3b SHA-1: 752463559a1e5b9853e1d1bba3c7a80b16894a62 SHA-256: b37827b72ad07efccdda128c6fe93e32320182d16d8218234bc9e01d4d8a1a5d
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and redirect to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings suggest a link farm designed to redirect users to malicious content.

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-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://gettraff.ru/123?utm_term=samsung+mission+statement
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fe2806634034.pdf
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f87c60fe5d2d.pdf
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fc955b11176e.pdf
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/diremitewobofubog.pdf
    • https://motuzasejufabo.weebly.com/uploads/1/3/4/4/134498516/ddac68761a8.pdf
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/zuzunegufobir.pdf
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/414915.pdf
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/c2398dc80.pdf
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/6386240.pdf
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/wumolasudeligen_jarija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73c28936-fca6-41bd-8fac-a3d26685d4d0/common_mistakes_in_english.pdf
    • https://s3.amazonaws.com/wovugi/wasetejeso.pdf
    • https://s3.amazonaws.com/nitatotol/ponoditemixijuzomofo.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/download_team_win_recovery_project_apk.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_off0000de5c.bin
b06d59d57a85652af32fd48716cd1fc4407e96b2107a85c2b42d301e1c34abd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 4980 bytes
font_01_sfnt_off0000ef3d.bin
dea445f3d0a9db2ab79a4226daa3a129772861c8d262170a0893216c51040e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 9936 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.