Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e43a8d5b05d05a8…

MALICIOUS

PDF

70.4 KB Created: 2021-03-24 04:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 332276176ed76f7cddcf2dfaae6c0128 SHA-1: b765f178a5730aa4072e4638ef927e9f5bf8afc5 SHA-256: 9e43a8d5b05d05a8283ffd1940574d6f8d2a11d06ecd61cffe3df2fccc59d0e1
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://mezovuduw.ru/123?utm_term=breast+cancer.+csv PDF link annotation
    • https://cdn.sqhk.co/vetukalujir/hdcji3W/blood_pressure_readings_lower_in_the_morning.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/tepatolatazak.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/Kngc4gh/black_ops_cold_war_trailer_release_date.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/fe441d.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/4bf9b2a0a061cde.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/purafuni.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/2196613.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/vapour_absorption_refrigeration_system.pdfIn PDF document text
    • https://cdn.sqhk.co/vozogekom/3Cdhdzl/mubemevaxenunuwosid.pdfIn PDF document text
    • https://tadarumoroje.weebly.com/uploads/1/3/4/7/134724086/nufelakakezomitov.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/6181526.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/arFzjhC/cannon_shot_in_head.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_7796b8b182d746619dd0f2d228aa6075.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_91faa3e8a40849ad8cf40e6cce544b74.pdf?index=trueIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_5d3f60fb097c42efa779fc380502d5ce.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_4c25b209b1114e1dbb27fa6eaf89cebe.pdf?index=trueIn PDF document text
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_2551569e32f9447e936f6a82507f1ddc.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_51c0efe40bf74732b025cc3cb27c667f.pdf?index=trueIn PDF document text
    • http://tonavisuma.onlinewebshop.net/foxpro_wildfire_sounds_list.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_c5fddfd3028749a0a74a3897fba3d63e.pdf?index=trueIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/panduan_belajar_tajwid.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_60034cb88b4b468a84316e7a9cd77c6d.pdf?index=trueIn PDF document text
    • http://forojiwimudobo.atwebpages.com/26506548617.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_2e1638af7a6d453d9351e46357c92775.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_8a849c78afe14adb8ac399640e956bab.pdf?index=trueIn PDF document text
    • https://medlineplus.gov/breastcancer.htmlIn 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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 4904 bytes
SHA-256: 3037bac6a3da8143ae9cf96118a29856773517cefbf30b1898860e6f1330d608
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10304 bytes
SHA-256: 800396cc18e4154f72f2ee470abcf4076d3981e1e2f05cc0c9961db6120ce223