Malicious PDF — malware analysis report

Static analysis result for SHA-256 c720984c0507d415…

MALICIOUS

PDF

82.3 KB Created: 2021-03-03 01:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c9195d7b0690baf28ef6f901be091e7 SHA-1: 168f3de119501e9d3a8a9f03ad85a5c8e1cfce38 SHA-256: c720984c0507d415bd1f66f29a42d02730df9f8a023385f11b4622c1fb072b6f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Adobe Premiere Pro CC 2021', potentially used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=adobe+premiere+pro+cc+2021 PDF link annotation
    • https://cdn.sqhk.co/jabosuve/vCVggfh/koala_bear_baby_shower.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_5ffe6e864f74f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6012340647c55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5ff82c97c4307.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/57670072817bqvwl.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/mjiiijw/tekegikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_603dbf93d7b6e.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/iikiakZ/ivan_boesky_net_worth.pdfIn PDF document text
    • http://regse.website/pedubariwatixiateu5.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/ia7wx0B/88941743304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_603c57e926620.pdfIn PDF document text
    • https://cdn.sqhk.co/mikakiraw/zvCgfQN/phoenix_zoo_drive_thru_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_603e3ee2d18f4.pdfIn PDF document text
    • http://sait-ok.ru/50818869218se08e.pdfIn PDF document text
    • http://4338bacchus.com/92489136599alaie.pdfIn PDF document text
    • http://makamar.xyz/hbo_on_demand_not_working_optimumzlmfi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5ff5310e202c8.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/givewerijikifafufotekotaqb3qf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6004f9379b6f6.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/igijvyy/golemopusajugimetojup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 7196 bytes
SHA-256: 127a08950affe6777c54df89bec7761e0447342b39ba53fb3d7136340f414893
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 5252 bytes
SHA-256: 632e193773e89a7c971f6395a9f6eb81f02d5255ee92711233ccc62581a3204b
font_02_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10916 bytes
SHA-256: 4588a4a15d85061092dd6599fdaaf980554d278c346ffb8bbb035dbbdbd0ccf7

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