Malicious PDF — malware analysis report

Static analysis result for SHA-256 72589ac7b7d45bbf…

MALICIOUS

PDF

76.0 KB Created: 2021-02-14 01:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3a60a1a58e45a88a4953aeda1d94ecaf SHA-1: 8fc5e3a316c9d6dd8fe61e98cefc6c249fee7ea7 SHA-256: 72589ac7b7d45bbf562cdb42be8fe48b5a811721065326e8eed4f3172ee85aca
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=bollywood+movie+song+video++2017 PDF link annotation
    • http://hangookoil.ru/67539127670dx4n7.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/5Sigia7/36273000013.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/x9hdST9/homemade_halloween_pinata_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/fghktgj/12067550045.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/vjdgjig/31407249810.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/ckMn9ij/revititimovotor.pdfIn PDF document text
    • http://kyukty68.xyz/physical_geology_laboratory_manual_a1ljdb.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/icjdHjj/the_wolf_of_snow_hollow.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/dkyjiif/car_driving_simulator_apk_download.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/fisopalirerutunupikuwuwaf.pdfIn PDF document text
    • http://znakomstva18x.site/cool_edit_pro_2.1_indir_gezginler_trker9ccu.pdfIn PDF document text
    • http://vashastrahovka24.ru/11852042451l26vo.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
    • http://pakefuvusenoz.rf.gd/90382347365.pdfIn PDF document text
    • http://pulupalu.epizy.com/tikudubewemiwabavuno.pdfIn PDF document text
    • http://xarifilaf.rf.gd/98315267713.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_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 5256 bytes
SHA-256: 1465a6b2ea6dbb8aa4923d2180c0386decf5b8160bfbc3ba5addb5e6e9a6b30d
font_01_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 11164 bytes
SHA-256: 4e4bdb5d8313cb8010597790ccacc195da438ebd7d74e1ec2be0e8e8f0f5f5cf
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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