Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa418ba95679f0a2…

MALICIOUS

PDF

114.5 KB Created: 2021-01-07 13:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 253a56eec4e0fa598b63671fb17becd1 SHA-1: b15af9bcb6127ec006e9350a8989899c2ba908fc SHA-256: fa418ba95679f0a2be41489a6cba4ec7db6f3ead7605cde2f67e2c831e588bcf
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links designed as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/wb?keyword=hitman%20sniper%20assassin In PDF document text
    • https://pareropifu.weebly.com/uploads/1/3/4/3/134349273/govun.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/9e1f5ffe.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/iajiOhg/free_movies_hd_app_xbox_one.pdfIn PDF document text
    • https://fenatelelopowi.weebly.com/uploads/1/3/4/5/134510159/9387849.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/ceae648fad6124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_5fc1bfef8001c.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/dirivobud.pdfIn PDF document text
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/266293.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/xewis-wuzirew-malurizenupuz-nituvikasadiv.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/wukara/bonadexoworufejamubaxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994dab72-a35f-4d04-b500-9c72f91653b2/73965477430.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/accretionary_lapilli_formation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a236e0-fdf7-442e-8ad4-374fde8913f3/zososuzijag.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/jozemuvuwipa.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_off00017952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17952 4892 bytes
SHA-256: e043db725adceee013a44149982b1a78a292ca378c6e3e016c477fb3df1327b3
font_01_sfnt_off000189d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189D6 16580 bytes
SHA-256: 99a7a0d045c3fefb492c079f70dbcdb712cdec59b679ea88ff5f6f2c22728840

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