Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ff631ab5f76b9c…

MALICIOUS

PDF

92.8 KB Created: 2021-03-31 08:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df236763cc0ef3413f134cf768910377 SHA-1: 21284dc3ad560bd16ea2bc2f63fcfcec006700f3 SHA-256: 81ff631ab5f76b9c7e428ce96bc364e19584014142e72aaa1a089f094f967a7e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one heuristic specifically identifying a "PDF_SEO_LINK_FARM" indicating a large number of external links. The document body, though partially garbled, suggests a "Xslv fact sheet" lure. The presence of external links and the ML classifier's high confidence score point towards a phishing or SEO spamming attack pattern. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=xslv+fact+sheet
    • https://cdn.sqhk.co/pixafosabow/acdjbgj/razexisuwinugotevabi.pdf
    • http://popotuwilavab.iblogger.org/credit_risk_modelling_springer.pdf
    • https://cdn.sqhk.co/sevijeruba/p5O9jiQ/83052559259.pdf
    • https://cdn.sqhk.co/matikefateri/dficiem/download_game_viking_heroes_war_mod_apk.pdf
    • https://cdn.sqhk.co/pidagasew/1wcs8gg/moto_rider_go_highway_traffic_play_online.pdf
    • https://cdn.sqhk.co/fonizijodi/YNhegir/heroes_of_order_chaos_apk.pdf
    • http://vemexulitoko.iblogger.org/antes_de_empezar_saluda_a_todo_el_pblico._recuerda_1_of_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rovikibixu/90726273089.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_0bb11d129d654bcb96727813543f3459.pdf?index=true
    • http://naxufiregukorer.rf.gd/zabizutevetusezoposepa.pdf
    • http://niforubuduxema.epizy.com/wopojeloj.pdf
    • https://s3.amazonaws.com/tesotiwapax/4_qul_sharif_in_arabic.pdf
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_faa651a0e1f743ceb2f3c2e573bc0da7.pdf?index=true
    • https://s3.amazonaws.com/rekorewexidiwo/dewalt_cordless_drill_set_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/50203a14-fa0e-4c5a-912d-d6c6ee0cd64d/how_to_disengage_hydrostatic_transmission_cub_cadet.pdf
    • https://s3.amazonaws.com/tevomenil/small_baby_girl_photos.pdf
    • https://uploads.strikinglycdn.com/files/712a8381-513b-459e-97b3-d60167ac6725/suunto_x-lander_black_leather_strap.pdf
    • https://s3.amazonaws.com/rebomedug/23424483826.pdf
    • https://uploads.strikinglycdn.com/files/feb1a880-b9c7-4128-9d55-a6d298d6bbda/esv_lutheran_study_bible_online.pdf
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_dbb5d1fb3f154310803811f5152001a0.pdf?index=true
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_c7bf2029abc94d4885f19764bcf2f4c7.pdf?index=true
    • https://www.cancer.gov/coronavirus
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001231a.bin
461fe2ff7941de392688e3ff4a6ce4225ef21c0c80c90f5a32e95b8daf69ac40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 4436 bytes
font_01_sfnt_off00013230.bin
58d60e3e9b87294825badd451784bed0a42d421376e5d2d2daa6fd16486a6ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 11100 bytes
font_02_sfnt_off0001579a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1579A 4324 bytes

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