Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fffaa26aa3bdab…

MALICIOUS

PDF

62.7 KB Created: 2021-03-18 15:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70e19d4b0c3e6144cd263ef393c0d9a5 SHA-1: 5ce3cfa659ef27394fd456f76da15f7a9ac681c2 SHA-256: d6fffaa26aa3bdab3f554cd2ffbe8504625a90c911c1d1d5d50e96391161ec1a
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the presence of external URIs and the heuristic firings suggest the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9517

Heuristics 4

  • 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
  • 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://xajibur.ru/award?keyword=din+513+buttress+thread+pdf
    • http://bufo.online/240940466583d2lo.pdf
    • http://videohost.space/deluxe_ez_bow_maker_instructionsu04fa.pdf
    • https://cdn.sqhk.co/tamurikubol/h7ZAqjf/13660822912.pdf
    • http://bufo.online/brother_mfc_j4510dwechdg.pdf
    • https://cdn.sqhk.co/mimofeto/eVdE9HP/13345184085.pdf
    • http://obschee.xyz/suvevususemuf0ihw.pdf
    • https://cdn.sqhk.co/rexixugepir/hhblgeu/72208258981.pdf
    • https://cdn-cms.f-static.net/uploads/4407302/normal_6040daf8b1580.pdf
    • https://cdn-cms.f-static.net/uploads/4470029/normal_605077c55221a.pdf
    • https://cdn.sqhk.co/rutunidosaw/dghheJg/mech_arena_robot_showdown_review.pdf
    • https://cdn-cms.f-static.net/uploads/4421477/normal_5fe81e5664c22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://liramovabo.epizy.com/48816379196.pdf
    • http://zerekigukazaja.epizy.com/80638412838.pdf
    • http://xadogugatu.epizy.com/inorganic_chemistry_notes_for_bsc_1st_year.pdf
    • http://rezazaje.epizy.com/your_name_english_dub_audio_track.pdf
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_cc40cc9bd0224544b41acd1c281ac4a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01d51f33-1b3e-47e6-90a6-0835d133deec/70383687527.pdf
    • https://uploads.strikinglycdn.com/files/3f122201-b356-4628-b458-b7497812ffb1/62272409673.pdf
    • https://uploads.strikinglycdn.com/files/a84c08d7-1e3b-45c6-aa94-79260439b548/guitar_chords_chart_for_beginners.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_4ebe2ecb31e54acebf10b12ad8ab8a44.pdf?index=true
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_fbbe9e5c74b647b6a25a9d6c365e71f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88422645-0e1c-41aa-b1a1-4feb0e10d2fd/tecknet_mechanical_keyboard_review.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d8.bin
104c79ce6dd3a190e7bf0edb4fbf11e71407890921f760163d523e5ce5e0d220
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 5576 bytes