Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6ebe11b8a73947…

MALICIOUS

PDF

88.2 KB Created: 2021-02-27 14:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bc2d6b74ca027d9dcaa8bff3d7b25a05 SHA-1: b3c36812ee2f4b0c89e156201246beb894acba08 SHA-256: 5a6ebe11b8a73947765bbb9765b5e2d2edf06db7b9d44684cc65e278f899b913
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'vilenefex.ru' suggests a redirection to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata related to PDF generation, but the primary threat appears to stem from the embedded URLs and the overall classification.

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://vilenefex.ru/award?keyword=is+music+streaming+profitable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381980/normal_60094c8a382b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_6022e7f19fdb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_60029fd7c9c28.pdfIn PDF document text
    • http://bevarep.22web.org/beginning_algebra_richard_n_aufmann.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/hbgdf1E/tifuri.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/PhfYkid/51821344306.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/hbjejjc/rock_band_2_drum_solo_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/hQha1kK/mini_stereo_radio_cd_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fifowofuzapuzo.epizy.com/international_divorce_attorney_near_me.pdfIn PDF document text
    • http://zaxalamel.rf.gd/70732187173.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/deralopevipabalidotizar.pdfIn PDF document text
    • http://sufapanizesemot.epizy.com/chlor_clean_wipes_safety_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/48772819202.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/dj_b_bashment_riddim.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/onion_cell_mitosis_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/58247850553.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_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 5412 bytes
SHA-256: 1628ee05b2f825a5d14e09630014543a5ec0f1df170e387b5762c884b975e4d9
font_01_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 10852 bytes
SHA-256: 39480ecf056500c498b7a15f72bde401008a99bcfda512e19463838abc0a8156

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