Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d867ca94e0d7a42…

MALICIOUS

PDF

109.9 KB Created: 2021-04-09 05:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 56ecc4c811d937f8e9b0bdbbb1bab235 SHA-1: d06749808a4b526c60160b41b2fd316de4b405c1 SHA-256: 0d867ca94e0d7a42b95a50550fa7e74d3d969987d0be98fc6d4f47527fb8b326
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious or spam 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://baarspo.ru/strik?utm_term=navy+chief+eval+pdf PDF link annotation
    • https://menavexijipiges.weebly.com/uploads/1/3/4/5/134599349/datuxe_datarivinipava_lowomixivevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_60698bd07d6cd.pdfIn PDF document text
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/luxaf.pdfIn PDF document text
    • https://domomizidum.weebly.com/uploads/1/3/4/2/134235459/numalipobuj.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/87b1de7bd4494.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/viradivafebagotisiko.pdfIn PDF document text
    • https://letemoxitaja.weebly.com/uploads/1/3/4/4/134475957/vozupar.pdfIn PDF document text
    • http://penageli.getenjoyment.net/can_you_use_a_universal_remote_on_a_hisense_smart_tv.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/4208946.pdfIn PDF document text
    • http://sonasutos.mywebcommunity.org/96128819584.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/benefits_of_value_chain_analysis.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/9748341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_602bf424489c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugazepoja.onlinewebshop.net/grounding_techniques_worksheet.pdfIn PDF document text
    • http://zesugipove.onlinewebshop.net/how_much_does_a_gas_furnace_cost_to_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95999210-6ca8-4667-a951-232b3c884192/purebesivanaligud.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/32411615787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16ae9e3-e410-4203-a4a1-71dc61382fef/wilma_rudolph_unlimited_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c5fb15-f21d-4ff8-b5d9-c07b2c7c3d25/the_unbearable_lightness_of_being_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73030c2d-2fd1-475e-a8bd-fe0de0b476ff/how_to_replace_vivint_thermostat_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43f796c-863a-4dc9-8ecd-df95c9b425bc/8284927639.pdfIn PDF document text
    • http://maxuluxusit.atwebpages.com/xokubulexoxirenasuju.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_off0001723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1723F 5100 bytes
SHA-256: 2ce1fc4743190591dc09b146a0edeef87f60c1811a48223f58477afc711400d4
font_01_sfnt_off000183b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B0 11172 bytes
SHA-256: 193f4142330402761ea6264cecd8a35dd3cda701b682014c0f8c2171dd1892c5