Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67fad02566f144e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 09:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a01b0c62226b80776b49a22c9639011 SHA-1: 3d8fdee3558229f2c0363d250bf75e375b8df8bf SHA-256: f67fad02566f144e283eb3846566df66e0b4c8fdbccd3ccc572d23b7926a3e35
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains numerous embedded links, with a notable example being https://crophysi.ru/123?utm_term=audio+books+free++websites, which redirects to potentially harmful content. The presence of many links on disposable hosting further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=audio+books+free++websites In PDF document text
    • http://nadipewin.mywebcommunity.org/homelite_super_2_chainsaw_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/MRhcjgW/drought_problems_in_california.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fcd5d789646c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_600eacbfabd80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6012dfd4a03bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_603b79038cc86.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/hiaR3hh/bed_furniture_design.pdfIn PDF document text
    • https://cdn.sqhk.co/vixivizal/ihg8ajF/xatalinidupivilokaz.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/47800735769.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/xebuvuwov/kobekerafojafuton.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_e8695ffd99c047ee8799670c745e668e.pdf?index=trueIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_44b0536566864eabb6aaa3e95c2cb128.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadada97-d596-44a5-a425-0dd9c6e640b3/16917684920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48629fb-9124-43a0-80af-0c50527236ce/37356455708.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/xajenurizefazarilixi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/tatorafidugojisir.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_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 4944 bytes
SHA-256: a84fde8ca5f94dcf5a8204c657ed16a1a09908dd11ab07c4487d943c5295867a
font_01_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 10980 bytes
SHA-256: db8e5d6f17fe15b2cb73d9b532df39af6d4caa000a4ae7e229007f0a279804c8

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