Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbafc4784625475…

MALICIOUS

PDF

93.2 KB Created: 2021-03-01 12:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 93d4340d0d228b2538286d1a3871fd00 SHA-1: af14e2bbaf1d5101ece82022fdc1af54f57730d6 SHA-256: dcbafc4784625475d91b3e24539eaba5b8756266cea8842d4ee7000dc27011b3
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 designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that ultimately leads to a malicious payload.

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://nipisod.ru/strik?utm_term=discrete+mathematical+structures+with+applications+to+computer+science+free+pdf PDF link annotation
    • https://cdn.sqhk.co/kominepoli/ieibFgc/94987170389.pdfIn PDF document text
    • http://walabakubu.iblogger.org/latest_android_version_for_galaxy_note_9.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hY6nNgd/fidget_spinner_collection.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/4lijheF/fujemabamibidevazabomodu.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/TXy9Fhg/map_navigation_voice_language.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/qji3Ggg/new_english_songs_2019_video.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/the_giaour_poem_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/bZogijj/34813084077.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/h5Q3YCX/business_process_management_organization_structure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvosi/vigusaniwanakafif.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/44465526129.pdfIn PDF document text
    • http://kiwozoma.epizy.com/transformers_animated_megatron_vs_autobots.pdfIn PDF document text
    • http://xapemekofutomun.rf.gd/miracle_thunder_latest_setup_2._98.pdfIn PDF document text
    • http://rozibata.epizy.com/anne_de_green_gables_volume_2.pdfIn PDF document text
    • http://fipivolakiwupod.rf.gd/86444254771.pdfIn PDF document text
    • http://soxupagab.epizy.com/semed.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C62 5484 bytes
SHA-256: 3b2b4d11a2025880d67c0769b1e3b9f5a430044b5613271c718f45f89f557e00
font_01_sfnt_off00013ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF7 11996 bytes
SHA-256: 42ef0482aade375b891921881970c37ca3e23db9cf559ef8e535e52c0d05735f

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