Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6894b780124934…

MALICIOUS

PDF

79.7 KB Created: 2021-03-10 05:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 2d68cf8d1e02a1a826417524a4f9f6a7 SHA-1: 59ef92c7110cc085cdfaa8d43a02a89d61aa8034 SHA-256: 6f6894b78012493440b98598a1b1ec4039ee6556f6510c3dd8b4d7b8f929d2a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

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
  • 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://pelibifir.ru/123?utm_term=constant+current+coulometry+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5fdc0c549d5bc.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/gh5Tgiu/fikimubakuseduxav.pdfIn PDF document text
    • http://wibofot.22web.org/4700995443.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/8768174.pdfIn PDF document text
    • https://cdn.sqhk.co/zivalutapa/ejduhcU/vusivuriwiladog.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/jhISphh/9323097425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_6033d7d8ab8a5.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/eogiidf/easy_lemon_drizzle_cake_recipe_mary_berry.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/n3hcLja/mcgraw_hill_connect_accounting_answers_chapter_15.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/can_a_federal_judge_be_fired_by_the_president.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5fed72a6e8c50.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/fosigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_601d94180c492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fisumude.rf.gd/25315927046.pdfIn PDF document text
    • http://satonavuka.rf.gd/ich_guidelines_stability_zone_ivb.pdfIn PDF document text
    • http://jopubijako.atwebpages.com/2014_subaru_forester_owners_forum.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_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 5308 bytes
SHA-256: 229299df56b65ee03cf872ea93554b0ecc162ffeb27113ea73e99cad8621d5f4
font_01_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 11360 bytes
SHA-256: aa5e0ba25ef42ee9c7c3a6c46cc598556278ea459d0f2771d2465f1aea24d96c

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