Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fb9d6fcb6a43fe…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 21:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 20f1e8f90dd39877a182c64415b7c10e SHA-1: d6fb6464fdab028b02ec84cdbc30e60b7228c150 SHA-256: 56fb9d6fcb6a43feb7191c278aa58ab8efb1b9024a5b9529dd15b9b937dd6e14
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identifies it as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/strik?utm_term=steins+gate+0+routes PDF link annotation
    • http://umkatrade.ru/runes_of_magic_druid_guidee74mn.pdfIn PDF document text
    • http://gofimowekes.66ghz.com/yankees_players_weekend_uniforms.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hacXAjh/prestonplayz_youtube_roblox.pdfIn PDF document text
    • http://familyit.info/miraculous_ladybug_amino_engliship8iy.pdfIn PDF document text
    • http://secret-empire.ru/77999729209oyq9n.pdfIn PDF document text
    • http://itanah.space/pdp_xbox_one_controller_review435hj.pdfIn PDF document text
    • http://nazhivy.net/7802683305115j4p.pdfIn PDF document text
    • http://okrasote.info/45830405126jz98d.pdfIn PDF document text
    • http://mmeueue.space/66936482798511xx.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/b1a81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/tiraxudolusulojuwemivixon.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_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 5064 bytes
SHA-256: f63c51d3763d9a145a0d457fc1031ff45656d8367b20c2831673c64946abe622
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 10800 bytes
SHA-256: f5535f8b9fad0a8b71e9083bfb4610adab887799f9fa4a748cdc87770b175313

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