Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcd21c155c1567e…

MALICIOUS

PDF

81.3 KB Created: 2021-03-12 09:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6afd35d95e76aaa3a60f51ef77332041 SHA-1: cc28842f6c3edcbfe79e47ef4a62797b781745ec SHA-256: 4bcd21c155c1567e8e1882f8842369262840a79fb7919d71e06af1a107fa8740
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' lure further supports this, suggesting the document's purpose is to trick users into navigating to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/award?keyword=rte+admission+2020+20+form+pdf
    • http://gmetry.online/16014845190zwjic.pdf
    • http://wei-nmvc.com/56464137346h4pz7.pdf
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/3939346.pdf
    • http://mail-autoscout24.net/luwolizodixo7bhrf.pdf
    • https://cdn.sqhk.co/tapowifilez/hdihhaw/incantation_and_ritual_flute_sheet_music.pdf
    • https://cdn-cms.f-static.net/uploads/4415326/normal_60182d8a33d98.pdf
    • https://konizalo.weebly.com/uploads/1/3/5/3/135388679/1f4a41a51.pdf
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5ffdb3f59717b.pdf
    • https://cdn.sqhk.co/saseponirifa/Vmif10a/disney_plus_subscription_support_phone_number.pdf
    • http://trafikcezaodebayisi.com/rakoxeveavs2k.pdf
    • https://cdn-cms.f-static.net/uploads/4367632/normal_600b6a105df70.pdf
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5ff21368ee986.pdf
    • https://cdn.sqhk.co/pukikojat/ijyYELg/tadoniribop.pdf
    • http://otomail.business/18231902491z3o53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c427f36e-e2b1-4d5e-bab8-fed4daf8bab9/naxizekolebafu.pdf
    • https://uploads.strikinglycdn.com/files/b7ac6d68-0a9a-48ce-8fc3-05762f127224/reading_like_a_writer_quotes.pdf
    • https://uploads.strikinglycdn.com/files/99b6a8ce-9aa9-4221-8bf9-8a15e35a5340/graphic_design_bookstore_amsterdam_course.pdf
    • https://uploads.strikinglycdn.com/files/b87e0390-7990-4219-a031-2514dfe949ff/9503927943.pdf
    • https://uploads.strikinglycdn.com/files/5c323fdb-c74a-4479-abfd-3c50e48bc6e1/is_lady_bird_lake_trail_open.pdf
    • https://uploads.strikinglycdn.com/files/0ebe8299-b21a-4b1a-b9ca-2bb864f213d4/att_u_verse_tv_codes_remotes.pdf
    • https://uploads.strikinglycdn.com/files/60961696-8e3c-45f6-b8e2-9ec455cfe8ef/dadiwuve.pdf
    • https://uploads.strikinglycdn.com/files/de8fe913-24f9-42dc-83fa-0db4f13bc94d/vojonumuxipulamipo.pdf
    • https://uploads.strikinglycdn.com/files/69ef12fc-fc9d-4121-8c29-7b8e4dcfb43e/fisher-price_auto_rock_n_play_manual.pdf
    • 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_off0000fffc.bin
960dfc93ece63e9408c85a69383eaff5e1bc86e7abb01d71092ca0dd600e5d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 5436 bytes
font_01_sfnt_off00011265.bin
c947e19ae94ec80e70a8d3c669bb57f2bbe37e0abae901c205c1a3296b84fd96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 10848 bytes

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