Malicious PDF — malware analysis report

Static analysis result for SHA-256 2517ff62bd20bb36…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 06:27:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eab1a62556457f1e8446b3ed0ba1c371 SHA-1: 411e835178f01920f7dfe33cc17c1a05e8e5d3dc SHA-256: 2517ff62bd20bb36a95893fab611da2c461247420c1cbb76ea23b95a01b8467f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and a suspicious domain ('zajinet.ru'). Heuristics indicate this PDF is a link farm designed to redirect users, and ML classifiers and ClamAV strongly flag it as malicious, likely a phishing or trojan distribution attempt. No scripts were extracted, but the structure suggests a malicious redirection to external content.

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://zajinet.ru/award?keyword=berlitz+english+instructor+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413570/normal_6029fe1b1b696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_60479414eee89.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/DgggfWw/star_wars_squadrons_gameplay_no_commentary.pdfIn PDF document text
    • http://socialwave.me/tvzion_apk_for_android_4.4.28kc1u.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/where_abroad_is_hot_in_april.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/jdbXzji/magic_rush_heroes_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/OOzcphe/82296700536.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/hjPifgh/android_emulator_for_win_10_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/Ahdgi97/53457944799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501029/normal_5fee708c2013b.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/fFijhaR/defitebeturoz.pdfIn PDF document text
    • http://alexandreablog.com/93685037785et5wn.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/mekiti.pdfIn PDF document text
    • http://usesucre.pro/kubadinefojarubegalovvd0ag.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/fOGjgha/h_band_app_watch_faces.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ee44507-bc65-4bbf-b889-601fc2b9205c/96545761458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9022ea2d-4a92-4bc0-9025-1f9db3446b5a/37835512782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefce458-f763-48bf-ac66-9e0ef5473b89/thermador_steam_oven_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8457d6c9-daa3-483a-a789-835359ece42f/jcpenney_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7d1edf-610c-4411-99f7-41f4ba669181/16949896911.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 5668 bytes
SHA-256: 7eccf91b2733860c5aeee541a61f80f70efbfc3866b11ad968be81d7fc73fb26
font_01_sfnt_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 10412 bytes
SHA-256: 069fab339cabd43ebe0b0ccbf25e92c27a3ce1cb2c7d790e65ee881dd23c8110
font_02_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 17124 bytes
SHA-256: ec614d262003375f671f66e48e6f648aefbbbd2d005ed7b34bd28b2ef2a823f3

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