Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c32e397c4d90f41…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 01:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6238251279bd4947d9ce2985276d3252 SHA-1: 1a20ea166304bbacf137b1c02e35a4d8b587274e SHA-256: 5c32e397c4d90f419246a4b27a583f967ceb3d8f90d90b5b1e5d92e589d9398a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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.
  • 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=the+vegan+stoner+cookbook+pdf+free PDF link annotation
    • http://masito.space/545189002661n1b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_60520d8f33b66.pdfIn PDF document text
    • https://navitadewota.weebly.com/uploads/1/3/4/0/134017874/bufojola.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/4309081.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/lilomanapojuf_kegetawediko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_60469d88cdbc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485573/normal_602afc1be74a3.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/lijavidekoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_601e089d4f2c4.pdfIn PDF document text
    • http://newberginvestmentproperty.com/power_bi_interview_questions_and_answers_for_beginnersqss2d.pdfIn PDF document text
    • http://petonopelun.iblogger.org/bilinear_transformation_in_dsp.pdfIn PDF document text
    • http://vsspb.ru/pokemon_platinum_official_strategy_guide1v9vr.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://wiinorama.space/93767964321xdl24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_601acf4dbd520.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/91446080130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_602a31f6bbf2a.pdfIn PDF document text
    • https://wudunuxez.weebly.com/uploads/1/3/1/4/131453857/rujif-zujelupolutadag-nilutavodef.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/tetoxonimif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_601b8c5a4e9e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/websters_third_new_international_dictionary_unabridged_online.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/sejarah_daulah_bani_abbasiyah.pdfIn PDF document text
    • http://lilufunom.epizy.com/fiwufodegisalibol.pdfIn PDF document text
    • http://mukefuzu.rf.gd/sql_interview_questions_for_etl_testers.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/banavotevit.pdfIn PDF document text
    • http://reladefuxuna.onlinewebshop.net/hunger_games_ebook_franais.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 5600 bytes
SHA-256: 863078686335417f4810019962de89d53778722b3db27ddbb77c8ee5f6da0d0a
font_01_sfnt_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10896 bytes
SHA-256: eb4d015d7d0c9bf49a996d458c22561cf182467f89e0e6d12a426b28117a8af0