Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e049bdd4dc1240…

MALICIOUS

PDF

77.9 KB Created: 2021-02-25 19:28:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 424a37e26a88b4b1bb49565227ff02d9 SHA-1: 585499f3f8c4b0808147c79099bc3ad126e12304 SHA-256: 34e049bdd4dc124020d55963dc36d6f193c4af244a01ec97c3f52fc31c669023
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain keywords related to search terms, reinforcing the lure of a legitimate document.

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://seumenha.ru/123?utm_term=schwinn+bike+trailer+front+wheel PDF link annotation
    • http://igafnd.org/maxuvodivedawawero7.pdfIn PDF document text
    • http://ziviludemedo.iblogger.org/adjectives_and_adverbs_exercises_intermediate.pdfIn PDF document text
    • http://xsafak.com/adventurers_guide_pathfinder0v2jy.pdfIn PDF document text
    • http://mirror-x.org/for_rawls_the_veil_of_ignorance_referred_to8nxjl.pdfIn PDF document text
    • http://gladkoe-telo.xyz/nijetiziligakexuzopo7hgz7.pdfIn PDF document text
    • http://migerov.xyz/her_mountain_baby_daddiesreabm.pdfIn PDF document text
    • http://nelitip.22web.org/braun_series_9_manual_cleaning.pdfIn PDF document text
    • http://wtia.space/42263774474pdgjs.pdfIn PDF document text
    • http://nibelv.xyz/3d_basketball_hoop3yup1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimarujevetuvif.epizy.com/microsoft_sql_server_2000_licensing_guide.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/rulaxitefupimojupopatak.pdfIn PDF document text
    • http://xojaxalevigob.epizy.com/57666301902.pdfIn PDF document text
    • http://nevurewajarip.epizy.com/25250208624.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_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 5188 bytes
SHA-256: 7b04e9c781ed7e57c2e26c334cc0cfb1133170ee4d660625d43d7ca31f337929
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10540 bytes
SHA-256: 0f9bb3b460c743af07d1904fc2b7ea5f8230231f7bde20e64bd62471f38fd6c2

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