Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9b6d136a8b0cbf…

MALICIOUS

PDF

65.6 KB Created: 2020-12-19 09:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b7a6025980e630df4e2ec445283085de SHA-1: be5eea8a1d84bf28cfd1e2753187b530743bf8a7 SHA-256: 5f9b6d136a8b0cbf31728991994ccde81b10315e1f3facd7b7a680861c5312c3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'Maytag washer repair manual', intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://cctraff.ru/strik?utm_term=maytag+washer+repair+manual In PDF document text
    • https://lexawuvake.weebly.com/uploads/1/3/4/6/134610488/865373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5fd1c0eb3fc7e.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/9910701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_5fcbc8f4f03a0.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/rulonakijux_vulesofuka_kusubuzenugom.pdfIn PDF document text
    • https://jowukore.weebly.com/uploads/1/3/4/8/134870909/4825188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5fa0d2073b4d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5fd5f5729f052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5fccb1e960579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3716dc3d-68f9-4cbd-8bf5-08b94daed35e/mozatobufemedewoxus.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5386f3dfdd95b60f16c7a/t/5fcc6c852bc7884852ac9b95/1607232647922/difogusig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58124f98375720d76a18/1606375442518/10523502446.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_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 5432 bytes
SHA-256: 1969c4f32b3deac589dbd5adb53d722e9a7ad9eaaedcfb472e36dec8bf3b3397
font_01_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 10104 bytes
SHA-256: feb892756afb449b70a577b74e11b3eb4199040bb7ba2c6619aa7ebfc90d426d

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