Malicious PDF — malware analysis report

Static analysis result for SHA-256 899f8ebae0a38769…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 21:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5df42dc95b2ff7dc85e12c42b322ef7f SHA-1: cdf701f9a55724716b069ad3b029ef84df5b60b6 SHA-256: 899f8ebae0a3876911df6e1a36e8dab5d9220a1d7e5c8665fb80b8fa49470205
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'bologen.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detection confirms it as a phishing/trojan variant. The document body, though heavily corrupted, suggests a lure related to writing advice, which is a common tactic for phishing campaigns.

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://bologen.ru/123?utm_term=how+to+edit+your+own+lousy+writing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5fded5bb6d4ee.pdfIn PDF document text
    • http://filfex.ru/munale6244v.pdfIn PDF document text
    • http://juilopkiretlo.ru/pavonifqibua.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_6035e1dcade06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_6011773b72e55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425533/normal_5ff88bf13261e.pdfIn PDF document text
    • http://istlan.space/95036915901tmxkt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475196/normal_6001d14b61e1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wewapozolebupo.epizy.com/96073905445.pdfIn PDF document text
    • http://miripiwamaza.epizy.com/project_costing_methods.pdfIn PDF document text
    • http://nabukewegurizev.rf.gd/games_like_animal_jam_no.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/excel_vba_code_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/croatia_and_slovenia_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/95795814695.pdfIn PDF document text
    • http://voresabuso.rf.gd/ansible_file_to_localhost.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/lumesiwewopemodarenig.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/digirarinedew.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/bilivozeweze.pdfIn PDF document text
    • http://mobijime.epizy.com/24450780063.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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 4936 bytes
SHA-256: 38697a3e9efd67ed6a357526acdbf952fa009644a140eb8daa227e277663aa17
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10428 bytes
SHA-256: e552fd616eb6324ad0ecf38a0299021d395c83cbc3609f734aff39fc3ddcc1c3

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