Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f74100bddd9ff4…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 10:55:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 21fc17429fd017fe608015944365767f SHA-1: 766f44efdcd9b5078922a9be51cf8189347ba157 SHA-256: 92f74100bddd9ff4976d6883fedccbca549db262f0bffee4e867536779ba65f7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farming tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the 'link farm' heuristic suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=what+are+the+types+of+errors+in+measurement PDF link annotation
    • http://gajozemexip.22web.org/aqua_regia_quiz_2017_questions_and_answers.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/dewisinigila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_60255bbfaaa73.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/babulupadoguf.pdfIn PDF document text
    • http://jekigun.22web.org/vatokuzufute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merekum.rf.gd/how_to_animated_templates_for_powerpoint.pdfIn PDF document text
    • http://jatomadot.rf.gd/animal_farm_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fancy_font_style_free.pdfIn PDF document text
    • http://posinumufupe.epizy.com/volume_of_cuboid_ka_formula_kya_hai.pdfIn PDF document text
    • http://rojaxenutu.rf.gd/cession_partielle_de_fonds_de_commerce_formalits.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/chronicles_of_narnia_full_movie.pdfIn PDF document text
    • http://juvuzonowokogu.rf.gd/quote_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/72848236053.pdfIn PDF document text
    • http://tabejarobovo.rf.gd/98693451023.pdfIn PDF document text
    • http://vipowiso.epizy.com/casio_illuminator_telememo_30_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/69982820297.pdfIn PDF document text
    • http://dudasuz.epizy.com/zamekafan.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/milpds_how_to_guide.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/dragon_age_asunder_epub.pdfIn PDF document text
    • http://nipitarur.epizy.com/konuvaluwepatez.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/85276123711.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/zinososajesoberositoneje.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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 4032 bytes
SHA-256: 787e8f75ee09f8b7f025f9cf4dfc6127883dafb781b08342e7a8a664aa527072
font_01_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 5224 bytes
SHA-256: aa143044dcd51d906e608587db65e3aafa30cf02bcfe579ad085ef6a8afd8f98
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 12824 bytes
SHA-256: fcb7a16c05663a57c9e29c284e0e765959800ccab2afed0e318f81ecdc8199e6

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