Malicious PDF — malware analysis report

Static analysis result for SHA-256 16740fda7d179762…

MALICIOUS

PDF

100.0 KB Created: 2021-04-03 22:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2fc2b7c6ff78ec7d0fc35d9785d11967 SHA-1: 6736bd2f7c82b32cdbdf95fdbd8642795c806d1e SHA-256: 16740fda7d1797628ecbdd538824942a1f735688ec5e767ab47aba4b8fe73904
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://kuzutuzo.ru/strik?utm_term=korean+vocabulary+list+animals PDF link annotation
    • https://kaxogabetex.weebly.com/uploads/1/3/4/3/134320086/nixumuliko_beruvemi_mojojofikavo.pdfIn PDF document text
    • http://slmit.fun/35817877366k5tvh.pdfIn PDF document text
    • http://forpost-electrica.ru/unreal_engine_4_tutorials_csq4dn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418796/normal_600415924ae1a.pdfIn PDF document text
    • https://xoduwotef.weebly.com/uploads/1/3/5/3/135328954/vozibakeroge.pdfIn PDF document text
    • http://rukozhop-guide.com/how_many_points_to_win_a_cribbage_gameoepsi.pdfIn PDF document text
    • http://instapodarok.site/accu_chek_fastclix_lancet_drum_couponvyqqu.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/didalaxobedotigonodatuper8z57f.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/1367551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6015bde7764b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_6016edd36d356.pdfIn PDF document text
    • https://puzepoxa.weebly.com/uploads/1/3/4/3/134318678/fipuduzad.pdfIn PDF document text
    • http://bioforcecolumbia.site/whirlpool_cabrio_dryer_stopped_spinning8h7vu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f61d9da-e75b-41ae-9b35-ae5530e9d8d9/40046288857.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/wonderful_tonight_tabs_fingerstyle.pdfIn PDF document text
    • http://panexorumilogim.myartsonline.com/17855147987.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/58935661832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdacb52-9361-4e8d-a4e1-87ea3b1bcba6/sasilojijuwirukaz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 31284 bytes
SHA-256: c2ed1f62eba6474fa6d297b77c48ed0278a5737806565f0c9064971a1bfa0ad7
font_01_sfnt_off00014b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B75 5216 bytes
SHA-256: 2e55f921c154409f88fcaabd6bb7afafa716013c51b87a9a9ee9ba2c063b4a27
font_02_sfnt_off00015d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2D 10524 bytes
SHA-256: 97d6057e37e9b2d8d6c875bd712f911e7a50b6182b9c5852f378583980b178ca

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