Malicious PDF — malware analysis report

Static analysis result for SHA-256 687f077163d55ddc…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 21:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f78af881bd7cca563a35517fbe1943f3 SHA-1: d224083d415dede15c9aaeccbaadcf13d6a7aa75 SHA-256: 687f077163d55ddc65352b87c4d3a8071a0b3d9214c72c5eb4745c2af596e0ee
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' disguised as a PDF about bioreactor types. The PDF structure and embedded links suggest an attempt to redirect users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://baarspo.ru/award?keyword=bioreactor+types+pdf PDF link annotation
    • https://cdn.sqhk.co/zobelekivix/gcrrPgf/rijewoxawapurifedezoraku.pdfIn PDF document text
    • http://liniwugo.iblogger.org/human_body_systems_worksheets_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/2Uiiwgi/windows_lock_screen_password_reset.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/the_grand_inquisitor_brothers_karamazov.pdfIn PDF document text
    • http://gudokav.sportsontheweb.net/design_of_single_scissor_jack.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/microsoft_word_convert_to_docx.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/jhHAohg/chirutha_video_songs_free_hd.pdfIn PDF document text
    • http://hookup750.website/79143843150oys7.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/ahigdXh/pixitracker_demo_version.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/soretupuxutegitot.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/1jb3A83/ribemaguvoxabokesu.pdfIn PDF document text
    • http://mosdendy.store/dish_vip722k_dvr_troubleshooting8c5ib.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/1iegiu9/buraka_som_sistema_hangover.pdfIn PDF document text
    • http://winoorama.space/gegawuvagosiruxow9pgg4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/jokulapefavevetobup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60282928-d75d-4625-868c-307ef8d91b2f/whirlpool_appliance_repair_seattle.pdfIn PDF document text
    • http://rotaduwifomol.rf.gd/434278420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9232bb1c-61a1-4eee-966d-d768ac2915c1/instep_joyrider_bike_trailer_parts.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_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 5268 bytes
SHA-256: e02aac66e06c9c20062c22710aa5c79ab1091f84ae4fdb1d7a9e94d4466c129e
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 11324 bytes
SHA-256: 57ddf7899c97e9a1861756422e73de17a269677160a7d0b5d30260a226d3fd8e

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