Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfc0ed17953fa55…

MALICIOUS

PDF

69.6 KB Created: 2021-04-03 16:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 398aded92f1e1cf97352f1ae754c2c31 SHA-1: 90fc12a470cd4f9ec05e975bebdfa457b2b0ff56 SHA-256: 4bfc0ed17953fa558bc6adb528027ff7a6d9ff0f08729e851f82cb1dccb3a203
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=cps+google+mail
    • http://scandisvet.ru/canon_eos_5d_mk_iii_manual4ird8.pdf
    • https://cdn.sqhk.co/bopelara/APK6ijF/40537435481.pdf
    • https://cdn.sqhk.co/vaxikinanibu/jajcKjc/mepuwudifezo.pdf
    • https://cdn.sqhk.co/kafekogi/VjcghvY/xugowejusevunuwososu.pdf
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/togubawegowose.pdf
    • https://pisixaxonazav.weebly.com/uploads/1/3/5/3/135394173/dawara.pdf
    • http://leafester.online/devotional_journal_templatexph5y.pdf
    • https://cdn.sqhk.co/guletema/Czxgige/background_music_free_for_birthday.pdf
    • http://opticsystem.website/dynamic_sheet_reference_google_sheetswy68q.pdf
    • https://cdn.sqhk.co/juvowisire/jidPifW/scene_definition_theatre.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8bf419b2-a8c5-438f-820b-19336b50a549/unitypoint_urgent_care_waterloo.pdf
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_ae8aada2761b4f4abd70b4f8c44deced.pdf?index=true
    • https://s3.amazonaws.com/roware/courtesy_callback_reporting.pdf
    • https://uploads.strikinglycdn.com/files/8d51dba9-b49c-4495-9b7a-5e048b83e5de/the_time_travelers_wife_movie_download_in_hindi_480p.pdf
    • https://s3.amazonaws.com/kitakilesa/graco_snugride_click_connect_35_base_expiration.pdf
    • https://uploads.strikinglycdn.com/files/fa51c6c2-1358-42f7-a393-8433d2fff3d3/troy_bilt_lawn_mower_belt_replacement_deck_drive_belt_a94.pdf
    • https://s3.amazonaws.com/pipaneku/zidoo_android_tv_box_x10.pdf
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_c4a96208dc4841428bd176fb610ee77d.pdf?index=true
    • http://google.cps.edu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d062.bin
dfb1e8c115594990d26af9ac4c0729faaee29c499a9db9d6c07e23868ff0899f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 4948 bytes
font_01_sfnt_off0000e11f.bin
be182e2f03b7ca79dade83c6521b335f134f1e1feccb5b7e989b7aaccfdceb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 12688 bytes

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