Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf73267dae9cadb7…

MALICIOUS

PDF

100.9 KB Created: 2021-04-03 12:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2abac2c086528029d0796d70133d3069 SHA-1: 791fdc8201333181d6e88ae5e666288e46d75e4e SHA-256: bf73267dae9cadb7818bc1ed04d6ad2b0e0f62a1fc7ea7ae7adea1853cdb3317
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the suspicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=classical+philosophies+specifically+virtue+ethics+pdf PDF link annotation
    • http://retys.space/90011110159uvs7g.pdfIn PDF document text
    • http://save50.pro/stephen_king_new_movie_november_2019d56u8.pdfIn PDF document text
    • http://famojefefe.iblogger.org/buboxeladidizojaxutozate.pdfIn PDF document text
    • http://onlinekartiadesi.com/92867533874gdz0t.pdfIn PDF document text
    • http://womakojufute.22web.org/biology_form_4_chapter_8_notes.pdfIn PDF document text
    • http://dupipavigojas.iblogger.org/naming_aldehydes_worksheet.pdfIn PDF document text
    • http://xanuxitawunavi.iblogger.org/boss_engira_baskaran_songs_free_starmusiq.pdfIn PDF document text
    • http://trixy-matrix.space/sudabapamozobcjdir.pdfIn PDF document text
    • http://blaugrana.ru/norwegian_cruise_deals_december_2020a1enr.pdfIn PDF document text
    • http://nibelv.xyz/58964390777hnwak.pdfIn PDF document text
    • http://peskomment.ru/impressora_brother_boa5mp7q.pdfIn PDF document text
    • http://garderob-podolsk.ru/poulan_pro_16_chainsaw_chain_replacementcqv4b.pdfIn PDF document text
    • http://my-favshoph.online/59197447070vz66u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vebavibokifoko.epizy.com/simple_bio_data_form_for_job.pdfIn PDF document text
    • http://jasilowesuvus.rf.gd/combiner_deux_fichiers_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/62051843845.pdfIn PDF document text
    • http://xotomupifejiref.epizy.com/introducing_spring_framework_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/zijaso.pdfIn PDF document text
    • http://gozegatunefafet.epizy.com/deadly_detention_2017_parents_guide.pdfIn PDF document text
    • http://pafomotaxo.epizy.com/66249191302.pdfIn PDF document text
    • http://mojinanatinezim.rf.gd/76932522129.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_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 5312 bytes
SHA-256: 66eecfa5572f621d16a0ddb60ca67714856ff683be140b84e91e2ee14054a77c
font_01_sfnt_off000161eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EB 10660 bytes
SHA-256: a079212bddf0acddd7c7ee846b948c05118fe99ab42b616834820dabb1b61616

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