Malicious PDF — malware analysis report

Static analysis result for SHA-256 831d0927aab2a306…

MALICIOUS

PDF

142.5 KB Created: 2021-03-22 03:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 821f74cd759df121fbfa5e83bd664423 SHA-1: b89350ef4c0e72784326883dbc9f58e7bd7d90b3 SHA-256: 831d0927aab2a3069b1ff291f789f91f53dfb48e6163f7724a2717a3028a51f8
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URIs pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external links suggests an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://jacksth.ru/wix?keyword=cummings+study+guide+macbeth PDF link annotation
    • https://cdn.sqhk.co/mevazasid/ehbnaha/wisepay_hampton_college.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/almirante_richard_byrd.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/fjgihw5/45299946585.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/42346270655.pdfIn PDF document text
    • https://cdn.sqhk.co/gowexenopa/3hhBZii/37707407852.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/gagokemanedibo.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/eujhTih/kadukatirimenutedikigu.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/best_apologetics_books.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/7lhixia/17911772460.pdfIn PDF document text
    • https://cdn.sqhk.co/baxujebane/Fibjegi/24289017776.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/cgchjEu/europe_1939_map_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vidikusupegu/EJoygjc/48904908092.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/2020_bmw_x3_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/ihTiagA/pokemon_fuligin_walkthrough_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/hejchcs/91955790294.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_cd3cd744edd44d4cb4bf95bad78f934a.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_cef3a3ff38d54ddf9cf9fc372f5a3304.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_0019b581f84d477cbe2eda1ce3b556a4.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_1f5a729108d545bc82c72273ab26773d.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_019e529c913d49408796f443b9caa490.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_004690fddc9540128330a0172345aeaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/asus_rt-ac87u_5ghz_not_working.pdfIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_6a6d439439474106a3132ba8e0394a1b.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_992c8ff6cbc448128147c832b291514e.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_02d10385b6ae416baf224d2e9d371853.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/piano_sheet_music_free_online_pop.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_25149653c5054b5dabdd733151bc99c7.pdf?index=trueIn 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_off0001f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F452 5372 bytes
SHA-256: 336adb80337295e3c23497877e9f1c2640249b25fd41bc71c76b751a81f84695
font_01_sfnt_off00020674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20674 11156 bytes
SHA-256: 4cf8c8d34beb0fc94a1f827885787b1c75d6b6e51637d97bf72e1f93baa21bd5