Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d2e2ed4daaaf38…

MALICIOUS

PDF

394.7 KB Created: 2021-03-09 08:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b8392e733a4e18016fadd64228e36965 SHA-1: 9acb11f30711194543cd5b6e7424819b508aa7e2 SHA-256: 31d2e2ed4daaaf382d0ebf57eeb9f91048e21151c1887b0580cdfe78c137e8c9
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The file is classified as malicious by ML and ClamAV, with heuristics indicating it's a PDF phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document. The presence of an external URI pointing to 'xezojetit.ru' and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt, likely a tech support scam or a fake billing dispute, aiming to trick the user into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/wix?keyword=digimon+story+cyber+sleuth+hacker%2527s+memory+digivolution+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/pixazizaze/WgdfifY/nokia_old_phone_ringtone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/haiaih5/rojopi.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/jjhfjja/best_video_player_for_windows_7_quora.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/lEjMfic/nhl_21_ps4_pre_order.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/hieggjb/maruduze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fd96924e085b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_3c62ad290ad145bb99d86e201cf583ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1286a2d9-79f8-437c-8e3a-15a3c897cffe/someone_shared_my_cover_photo_on_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0342c5-7235-4b69-92b2-0623a70c6b31/why_does_my_cats_eye_bleed.pdfIn PDF document text
    • http://vekamujibatebig.rf.gd/babies_photos_images.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/69286532775.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/80328231765.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/agriculture_college_in_trichy_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739680dd-830c-4d40-ba05-fed92e74b880/1472882214.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/best_way_to_listen_to_music_at_home_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53aa49e0-11eb-4558-a80e-f882522d28f9/95225579826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ff0224-b31e-453f-b639-9ca305df2acd/80028110582.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_e567c94f39804ed7a1ab78e4c454faba.pdf?index=trueIn 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
stream_006_off00052111.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52111 61592 bytes
SHA-256: b2eb557dc304e761b7058384657d1216003001e29cb3be2b2ec6560fa24f33e9
font_01_sfnt_off0005d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D84B 5968 bytes
SHA-256: 884b5716bc3f8f7f4adf286f1cd01dfa6bc43cd1420ac4d5d354f50a42726e1c
font_02_sfnt_off0005ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC8C 14788 bytes
SHA-256: 99005957678cf053c56d121ff9085fb0d0e5e5d890652f3556d913b75939fbd6

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