Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f49c931daf7e8be…

MALICIOUS

PDF

85.1 KB Created: 2021-03-04 11:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f4cf0ea64ee4e4d00ddd58ca2fdd0d12 SHA-1: 20153946012c2179d1deb63404936bfa01ea3e87 SHA-256: 8f49c931daf7e8be576fabb906cb0f745cfb7ff39d752e5f0b7b5e10683a8097
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration on disposable hosting and redirectors, strongly indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier output confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload 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://fokemale.ru/strik?utm_term=el+principito+resumen+capitulo+17 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369138/normal_5fe59a4c5a4bf.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/ihiiVhd/karixofisowuwajeki.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/ftqjfia/nagozowanap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_6012fb84c6225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_602e7f195e70c.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/jcjfvuQ/nosotazop.pdfIn PDF document text
    • http://appeal-ig.com/xoruxafokaxosimuwagogaat6fy.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/mesel.pdfIn PDF document text
    • http://tesar-krd.ru/what_are_the_advantages_of_bills_of_exchange9dv1j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_6009286890475.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/4UYugdZ/100_cool_games_unblocked_run_3.pdfIn PDF document text
    • http://wiinorama.fun/ocarina_of_time_3ds_romov40i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bejexe/what_do_sundry_expenses_include.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/lesogozaluwewiposides.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 5052 bytes
SHA-256: e4a78b374da0be1c57ad6e6d340b7025484890c0f6e7c4c6fd941c8e8498c26c
font_01_sfnt_off0001111d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111D 11828 bytes
SHA-256: 9797f4bfb6e9cad7f97888e8c8cf87ec4585323ca7c492023284de825e921c79
font_02_sfnt_off00013750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13750 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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