Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ac34df1243bfe6…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 10:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 525e7a7e088be29b014bdac12c32b70a SHA-1: 5662626cc4a4770f5c1a2de4372b0594b52d8ca8 SHA-256: 61ac34df1243bfe6d5f9cdbe37e79872d12a98ea20197123830c571995335005
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=phylum+bryophyta+pdf PDF link annotation
    • http://ruperamumafuvaz.22web.org/american_psychological_association_style_guide_6th_edition.pdfIn PDF document text
    • http://dixagodal.iblogger.org/bihar_daroga_mains_question_paper_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/gcxpg5M/deer_hunter_2018_mobile_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/jP7jajd/risk_assessment_template_for_project_management.pdfIn PDF document text
    • https://cdn.sqhk.co/fusexabuvej/gB5Z1jh/travel_emergency_contact_card_template.pdfIn PDF document text
    • http://vigufut.iblogger.org/rivubaputatokawizupofaja.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/zFjeAhj/zobojidevof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_4c88521e22cc453bae875448625aca99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06483d23-2629-4689-a2cc-8432535b39fc/the_missing_season_1_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe0bb1a-e616-4c8b-a20d-e0938010f46b/tofoson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/145d3ac6-cf7a-4a0d-9df7-dc3b15fddf9a/32774077843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce3ecbd3-f903-4e0e-af34-d69ee0833333/how_to_use_blender_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cddb850e-91fe-4f00-82bd-9da715c27bcd/que_causa_punzadas_en_el_cuerpo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1215e22-bf1c-4964-9f66-9768cfce7732/alkaline_vegan_diet_grocery_list.pdfIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_6b5afc6001b543019b7cf39ec1564a59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82af4f69-db3d-45d3-a314-3edadc7209d8/you_can_negotiate_anything_book_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f677a9b-6092-4f35-a00e-c82803be11b5/kowofolekirom.pdfIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_042b2fb0a65244ff8836b808b9876da0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6965c79f-9ae1-4ed8-a67f-f352bda333c0/zasopitipapidugodefep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a396aa-0c15-4c6e-aeaf-88a3f7749578/do_straight_talk_phones_have_mobile_hotspot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e224404-7290-4b52-b5cd-40cba1d1dfef/26467628130.pdfIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_83228f70d5e549318eb453f215cf7e92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23312bf3-b0af-4b2e-9df9-ac4e292e254b/zadasixufug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bd7ae9-4ade-4ae9-b09a-6f857096c0e0/82580214639.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_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 5348 bytes
SHA-256: 284b509eaa944b3983df28a78a6607ac7a786e158d47a47875dcc80546713ded
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 10208 bytes
SHA-256: 683879617ae9f1a7fd24979f41e29776413037b839b8155e7dd964e9745a7abe