Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a8c44179505ff7…

MALICIOUS

PDF

78.2 KB Created: 2021-02-15 05:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 766babe65951d5f5b0ad49c620b23593 SHA-1: 1a7a77c4d3e1b1e50e333b340664853ac2f6b4dc SHA-256: 34a8c44179505ff70d947cb1df87cbc3508aa1b471a5974e56a0964a40cbc8d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://seumenha.ru/123?utm_term=kitchenaid+9+cup+food+processor+plus+recipes PDF link annotation
    • http://smartcreditus.info/6976015752o48z2.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/awareness_campaign_proposallgde2.pdfIn PDF document text
    • http://itgermany.net/easy_love_line_dancefbz09.pdfIn PDF document text
    • http://ozalupa.space/the_official_sat_study_guide_2016yfro6.pdfIn PDF document text
    • http://kapusta.pro/anemia_falciforme_y_paludismoesee4.pdfIn PDF document text
    • http://startask.ru/30518750147voxy0.pdfIn PDF document text
    • http://kartaidatodemeleri.com/jalidj08j2.pdfIn PDF document text
    • http://wowunoli.22web.org/comment_apprendre__parler_le_franais.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lamekukibudinos.epizy.com/meal_planner_template_free.pdfIn PDF document text
    • http://ridejisedogik.rf.gd/normal_arterial_line_waveforms.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/fixorowenamuvogidasakola.pdfIn PDF document text
    • http://tokavazeweg.epizy.com/westfall_quest_guide_wow_classic.pdfIn PDF document text
    • http://vewomani.rf.gd/carpentry_and_joinery_paul_n_hasluck.pdfIn PDF document text
    • http://dujenovonufu.epizy.com/vikonilizur.pdfIn PDF document text
    • http://rolezudebozi.rf.gd/nulurigupij.pdfIn PDF document text
    • http://watenumedar.rf.gd/29439030141.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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 5368 bytes
SHA-256: ca8fbfb773244dc54ad26a159e3c527032b97c0b63889a4eaed057619334a4c7
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 11320 bytes
SHA-256: 73b4715e22d603c2c91fdbeba8ae2742080b44b6a2c1e4e58016e3281e4754ed

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