Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee85cd59e62c896…

MALICIOUS

PDF

76.4 KB Created: 2021-06-14 09:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9859a32f3b1801946e405d1a5d7af7b0 SHA-1: dfb7845cdc4eff6eb8895b871fd695bb292a4f09 SHA-256: 4ee85cd59e62c896db673e225e28760d9d23a894c428d47532206da2ea00e7af
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 hosted on disposable domains, suggesting a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://huntic.ru/pbw?utm_term=download+driver+wireless+802.11+n PDF link annotation
    • https://jifigisij.weebly.com/uploads/1/3/2/8/132814194/varugodokopexev.pdfIn PDF document text
    • https://jipibivit.weebly.com/uploads/1/3/4/0/134012636/06be702e671139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421207/normal_5ffba206994a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_6063dafdddab0.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/bupugo-kisab-sumutoxona.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/xidogepikedezis.pdfIn PDF document text
    • https://sisikirores.weebly.com/uploads/1/3/4/5/134529142/datedado-xekobaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fc76506e0195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_605687bf0c376.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/nejabugewos-golil-nolinodu.pdfIn PDF document text
    • https://gesebasalevajil.weebly.com/uploads/1/3/4/8/134879020/losidojolaba-gijikugufe-rugagogupifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosufixemuf.pbworks.com/f/different_types_of_3d_printing_processes.pdfIn PDF document text
    • http://wasazejis.pbworks.com/w/file/fetch/144814251/what_are_the_five_main_functions_of_a_database_administrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1152f78f-8265-44f5-bedf-1d10e9fd8fc9/63910798742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b136c2d-12b6-4f3b-b266-ee024d42ffac/41332416865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c836a04c-f8f0-450c-a723-16e209f2bd1a/multiplication_chart_1-100_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a4653da-0c66-4eb3-9622-d9efdd30fdd6/resumen_del_libro_de_los_muertos_de_los_antiguos_egipcios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c215deba-1226-4a13-beca-097a9f74de65/everstart_maxx_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf11e09-f567-4290-82ad-892c76a8b32a/il-1120_instructions_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a279c25-6bb7-4c04-b79d-4c69c06b013f/11312766900.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144771522/how_to_apply_for_improvement_exam_bise_lahore.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/145277010/free_full_games_download_bubble_shooter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f406ec15-66bd-4494-a1c9-b7c946d05c81/23172979599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68506c04-3d4a-4494-a8fc-fc01126d19fb/42957920308.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5524 bytes
SHA-256: 61a17c372083ca457e48fb52cffc0f7e9eb609c3508ed76b7d1e8947aa236e10
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 10148 bytes
SHA-256: 99f41bc7cc9701e513cfe9f700f9c255c0606ffed562ad366029c0d5d3d88b01