Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cfd32e2045cec3…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 05:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3229f26a6e035664e2a10a4abed59b7c SHA-1: 6147ab1cf1b6745b7b2a2479ce5ba52a8879fe4c SHA-256: 22cfd32e2045cec30f6142f37136135fdbb15f918355dacdb33b3984b8499559
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=history+a+very+short+introduction+arnold+pdf PDF link annotation
    • https://cdn.sqhk.co/definuseju/bhigihh/electric_guitar_parts_kit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_60446a935c02f.pdfIn PDF document text
    • http://insuranceautousa.com/zarerafepomejagapamutoal36l.pdfIn PDF document text
    • https://cdn.sqhk.co/diduwuposenu/fibxhaA/shark_ionflex_2x_duoclean_cordless_handstick_vacuum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_60185ce175514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_600074453b484.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/copaxone_prescribing_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_602d5e7734c21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_603bddcebc592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417523/normal_5fec5c18bc661.pdfIn PDF document text
    • https://cdn.sqhk.co/remonupode/hhcVCKe/58502088789.pdfIn PDF document text
    • http://petersikdar.com/endocrine_system_lesson_plan_high_schoolugwy6.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/TIIvifE/best_free_reversi_android.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/poulenc_banalites.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481162/normal_6021bb969b41f.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/phhljc9/fun_reading_activities_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_6020fa6a5dde2.pdfIn PDF document text
    • http://navalny.design/7-2_practice_similar_polygons_form_g_worksheet_answersp6sgf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fdbeeaed3f16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5ff657332a5cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/space_wallpaper_pack.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 5364 bytes
SHA-256: 9e32e84577a82f4b32513963468830673757721cbf36d7d5f62b9b623ea7b714
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 10556 bytes
SHA-256: a4ae90310f6ddfdf19a1419929780c6afea32b5905d1b1ababf4f3880caf123f

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