Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a7f7f6c32afd50…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 23:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a472bf1b9a4bb4d39e5c1e639ba62491 SHA-1: 98ab827ec885b412427ba0e32baa01c90fce8021 SHA-256: 36a7f7f6c32afd509f6fba38472efd695987ef7c76539a43896a53618a5d0f03
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=logical+reasoning+questions+and+answers+pdf+for+clat PDF link annotation
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/fc8d8ab4297d.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/megirupit.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/zivibanorijuzin-ligeligulam-xinezibimunoref-pekosu.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/15f949.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/bd4c64491b1b3.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/zosofowasi-zafofujigif-fatelelekipe.pdfIn PDF document text
    • http://presalon.xyz/kenoxowuvadifusojumunoro15hte.pdfIn PDF document text
    • http://s7hmus.org/ruvefaxenizapopavitodmjktg.pdfIn PDF document text
    • https://dimalosuzilem.weebly.com/uploads/1/3/1/4/131452887/xerume.pdfIn PDF document text
    • https://zotujovub.weebly.com/uploads/1/3/4/3/134354671/4ba7d1cdc8be310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_2893ae0567694a29a567f21ee3177c8f.pdf?index=trueIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_74d2bff4a7a842b2ab21ee1e5e7d4de4.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_aac3d430a6e841858cf0c33f9c482e47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc24b88-37eb-4906-b7ba-6376325e046b/wildgame_innovations_shadow_trail_camera_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703fc046-2dc3-451d-96a5-15318d7b7864/probleme_serato_dj_intro_hardware_disconnected.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebd906e-bb0c-44cf-b0db-c535e57f0f26/america_a_narrative_history_10th_edition_volume_1_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12017be7-d980-4534-b356-4b23af5b5815/gubadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cbb962-a2c1-42cc-a0c5-d55ef156f4cc/13295842790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8537342e-336a-4d43-94d7-61a1310ad0c0/the_bear_by_william_faulkner_main_characters.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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 5480 bytes
SHA-256: ed8125ed2516f98116fd7bb37c1dde4f4ebdb46f84056bb6f5fc3be9ab69b9e9
font_01_sfnt_off000105ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105ED 12224 bytes
SHA-256: 4b5ddf50d737b695e5473e89e0e69013c34c0b5532d395fd2a568ee28d6ed5db