Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b8eac80fa375d6…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 17:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc79dc27e09009fe00376d85e71aabcd SHA-1: 71ca624c208ab75348af1a0332daff3e6d07d028 SHA-256: 25b8eac80fa375d6459826dbb17dee236bfaf18966dd9586475d21646609873e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jottigo.ru/wix?keyword=idaho+speedway+karting+boise+id
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/nadujodivewon.pdf
    • https://cdn.sqhk.co/datawafag/o8GhbRm/7544408859.pdf
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/2dc8e2f6.pdf
    • http://choosemadam.site/cv1_coffee_maker_instructionspxce5.pdf
    • http://boevoenlp.com/bejunomasovimesipose5qjy.pdf
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fcc91e1efe9a.pdf
    • http://kamefutebiwef.mywebcommunity.org/mic_not_working_on_laptop_zoom.pdf
    • https://cdn.sqhk.co/jawubibegeba/Qicihhf/xesupetupugoxegidixenim.pdf
    • https://tifizadidamoz.weebly.com/uploads/1/3/1/3/131378816/bewimigo_lufegafiwofobu_sumasaripodete.pdf
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/b7fec79f0ee84da.pdf
    • http://dokojekiferej.mygamesonline.org/lab_report_biology_photosynthesis.pdf
    • https://cdn.sqhk.co/xezafube/j9wOjbi/ripajane.pdf
    • http://6gusevshop.space/8788988668073bt7.pdf
    • https://xuwapitevakud.weebly.com/uploads/1/3/2/6/132682402/6460814.pdf
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6011d29b75784.pdf
    • http://rufawefojag.sportsontheweb.net/bmp_image_to_converter.pdf
    • http://mnogolidov.xyz/72856023228dxozf.pdf
    • https://cdn.sqhk.co/kusewupudin/0G0Vdy0/anime_basketball_kuroko_full_movie.pdf
    • http://sagedix.medianewsonline.com/15341600376.pdf
    • http://arthromedshop.xyz/ielts_listening_section_3_answersrq2pj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f45e43ca-5d1c-4829-b254-9584ac29f848/how_to_do_exchange_rate_questions.pdf
    • https://uploads.strikinglycdn.com/files/3f94bf13-4cc7-4a0e-b35b-1d43df05bfb2/farmall_h_12_volt_starter.pdf
    • http://sogivuwe.onlinewebshop.net/97463835489.pdf
    • https://uploads.strikinglycdn.com/files/8580ea5f-b9d3-489d-b647-c02557e77954/viper_7856v_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e320.bin
9dc5840483d55565e40488efaa8327fe958e0656fd580c468ddc97b97acbfcdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 5524 bytes
font_01_sfnt_off0000f5f9.bin
6567a2cd33550040c7919975ff9d06a989ee105187c2e0412aabde5c1a164677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 11452 bytes

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