Malicious PDF — malware analysis report

Static analysis result for SHA-256 8391a11241f6c0b1…

MALICIOUS

PDF

69.0 KB Created: 2021-05-02 11:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 926350a8246710812e76c8bec63002bd SHA-1: e634363f0844df8dfd78110062184532901242cb SHA-256: 8391a11241f6c0b1c85437bedbb45274c276f07c1464b4610c5a710b5604fef0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://mezovuduw.ru/strik?utm_term=samsung+ln32b360c5d+manual` appears to be a lure, likely redirecting to a phishing or malware site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 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/strik?utm_term=samsung+ln32b360c5d+manual
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/43ebba3.pdf
    • https://cdn.sqhk.co/lotidonita/agh5hd9/puppy_wallpaper_hd_free_download.pdf
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/runulazezanajemozavo.pdf
    • https://static.s123-cdn-static.com/uploads/4481397/normal_5ff4153c51076.pdf
    • https://cdn.sqhk.co/vetumuba/ZibigGo/cbse_guidelines_for_class_11_accounts_project.pdf
    • https://cdn.sqhk.co/dasisogi/biihjhG/jugofowigekiwepuxuwef.pdf
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/noxopikumatavexetup.pdf
    • https://cdn.sqhk.co/pujalabasi/g9ieTjd/driving_zone_germany_hile_apk_indir.pdf
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/pisunomade.pdf
    • https://cdn.sqhk.co/radojiga/lqhgwhb/paint_by_numbers_kits_near_me.pdf
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/2556492.pdf
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/2b905.pdf
    • https://cdn-cms.f-static.net/uploads/4369524/normal_601e8efd42062.pdf
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/20a8599.pdf
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/kikujoloz-ranazelazitim-lefogugafom-wumejixebole.pdf
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/8226248.pdf
    • https://cdn-cms.f-static.net/uploads/4482863/normal_604ed0d29b5ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dobesogum/free_willy_2_streaming_italiano.pdf
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_702128e5fd784321a034d5bee5381b33.pdf?index=true
    • https://s3.amazonaws.com/wizedumi/29915697699.pdf
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_0f80aabf2fef40c797dee80f74b17a8f.pdf?index=true
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_94c21ae6557d43d9b669f17b85f8976f.pdf?index=true
    • https://s3.amazonaws.com/kaxukok/71507396481.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8958c03afd424133894e1f7627e6dfdb.pdf?index=true
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_2e0390e1b92f4c74a8899b02065b57de.pdf?index=true
    • https://s3.amazonaws.com/dixaleko/barska_safe_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_off0000ceff.bin
2ebb0368eeb83be1e54c6c78f37ad39055d89a5ec47a8b1c51b161096fc003b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 6120 bytes
font_01_sfnt_off0000e3bb.bin
b82f1f2510f2b6d78d2ecd300a2966f34187d2a2f6457200895e2a36d6617ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10208 bytes