Malicious PDF — malware analysis report

Static analysis result for SHA-256 4199a350fd7c8f98…

MALICIOUS

PDF

85.0 KB Created: 2021-01-24 02:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e6449c800bd6fd60b959eb3abcfed174 SHA-1: 9242d54ce72f0a8a9feac2887a0334b8ea55d509 SHA-256: 4199a350fd7c8f985993d5f2e405d7d88476b46c525e82e368aeeb2416e196d0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and subdomains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=age+of+parental+consent+indiana PDF link annotation
    • https://cdn.sqhk.co/bozadukopufu/Xfjbifj/rival_stars_college_football_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/giap41O/astronaut_simulator_3d_space_based.pdfIn PDF document text
    • https://cdn.sqhk.co/rowofabuf/gjlkify/58328844849.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/Gchhuge/weather_in_boston_today_pictures.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/kudupoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/5AHhb35/constitucion_politica_de_guatemala_1956.pdfIn PDF document text
    • https://muwegegedagus.weebly.com/uploads/1/3/0/7/130738526/wevakemirexiberuzu.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/xakumam_lajefiro_kebojad.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/gjAmhdE/55190849132.pdfIn PDF document text
    • https://cdn.sqhk.co/xafileme/fshjtif/suvevonizotowusuvoxur.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/gjgfjb4/79713062972.pdfIn PDF document text
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/9869f.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jdghHjb/wifukedugojilefukefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xegukamadoso.epizy.com/37143103808.pdfIn PDF document text
    • http://vutaxinasiva.epizy.com/accomplishment_report_example.pdfIn PDF document text
    • http://guradewididexep.epizy.com/vidmate_app_video_install.pdfIn PDF document text
    • http://rapuxatidugek.epizy.com/49174864844.pdfIn PDF document text
    • http://zilapiwet.epizy.com/38854866430.pdfIn PDF document text
    • http://suniwuvujibo.epizy.com/95705275568.pdfIn PDF document text
    • http://fabomisibis.rf.gd/hallelujah_sheet_music_free.pdfIn PDF document text
    • http://kudogal.rf.gd/86984234875.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_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 5312 bytes
SHA-256: 9ddfd95029ad10a484e7cf065b3d6b161c3a3578e704bd6c2836d79fa62ebc2a
font_01_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 12008 bytes
SHA-256: ad67764f72b17b9b73ba3cc15b91adcd19262ea96461788467ce65c1db971477

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