Malicious PDF — malware analysis report

Static analysis result for SHA-256 17af50e61f867dba…

MALICIOUS

PDF

91.7 KB Created: 2021-03-24 18:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d2e83240f2d2355b6977faa97cc43054 SHA-1: 01363da0becbc1db3e0fff15d05660e2a4c1d6c1 SHA-256: 17af50e61f867dbaff7a2224e08467c3de0132e1ac1478e32963f22e5cea896e
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 pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure for a free dictionary download, which is a common tactic for phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=longman+active+study+dictionary+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6009f00b7d22e.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/iiGhaid/meraxadoburopugidaresuv.pdfIn PDF document text
    • http://esclick.pro/notching_operationa3m5u.pdfIn PDF document text
    • http://lady-bug.club/rubolegureji3qa89.pdfIn PDF document text
    • http://sk-anker.ru/togarao6b4.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/qnjfLgf/ego_sword_idle_sword_clicker_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/xaQKjgV/lepubogipedalejowipifila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_5fd2fb37391cd.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/ohjgegh/67518676461.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/biahgib/ramepune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fec478ddb10d.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/xjhiiNM/modowebanapeluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_604d23668d30b.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/gdgj3t0/63832323844.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/dhKjejb/word_treasure_hunt_game.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/zabejuvijolu/a_scanner_darkly_monologue_what_does_a_scanner_see.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/barish_photo_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36b3fde-6042-4a79-91eb-079bd48be5c0/canon_powershot_sx160_video_quality.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/dexusotapetexulezuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2f7f16-9002-4163-af81-9f240ab71747/cant_connect_bluetooth_mouse_to_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fef4a25-4a63-400e-9b85-816e99efffa3/lean_startup_business_plan_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189a7487-0a36-4e67-81d3-42347dccfcf7/zozakazizozikur.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_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 5668 bytes
SHA-256: cac56e1141a50a3b59c9858a310c10d5033b7ce3d5124a5f601f0b6e4721d774
font_01_sfnt_off00013e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7A 10240 bytes
SHA-256: 4cb1d9346663c15643d3890a380cf5fd4d6989823746502890c384b93465669b

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