Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39467aafefed2d0…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 00:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35187d1715aed2fa70dc166948af8758 SHA-1: 258760b32966ce47d5104785e8fdea449c4c8261 SHA-256: f39467aafefed2d0fa4b49f0bcac05aefd47044be4562748cb8ef45d6fd173c7
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating links to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged the file as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be a lure, likely attempting to trick users into visiting malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=el+atravesado+andres+caicedo+pdf+leer In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405414/normal_6000d7fdad40b.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/the_revenant_full_movie_free_download_in_hindi_720p.pdfIn PDF document text
    • http://usene.xyz/gederazafenexo4wbge.pdfIn PDF document text
    • http://com-servers.online/suwowosavisurabgd0kq.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/16243461184.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/how_to_study_for_ap_art_historyhupqm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5ff57ec5d2f0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_5fda741a9d95e.pdfIn PDF document text
    • http://janusadow.mygamesonline.org/types_of_appeal_in_advertising.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/jamulemorirepuwegipamejow.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/porsche_944_owners_club_cars_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_a4348a51735c4a08aed8adf81a03eaa8.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_ba57106aa4c54d569ea93e97200aa9b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/548e6443-2483-4b47-a8d0-0f864f5ed0cf/inglorious_empire_audiobook.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_508ce4d785da459bb7a94668382c4ea2.pdf?index=trueIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/argan_l_arte_moderna.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_e3affa4db69044c4ab7e6877c8373a9e.pdf?index=trueIn PDF document text
    • http://keregimuw.onlinewebshop.net/ladedesijevulet.pdfIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_0a353d7173cd4e49bdcab68f8b9bf904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85e6d531-e270-4a96-b556-506dda855051/karcher_power_washer_1800_psi_manual.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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 5164 bytes
SHA-256: 88afb5885399e0f29476693e8018a69def53a787484a1f785314767bfd0db435
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 12332 bytes
SHA-256: 48ee9d92ed4a9bd7e5bc5d3e52627197aed7f348411cf8d40974a4df42c0f2a8

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