Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac20948d9ebb458f…

MALICIOUS

PDF

85.8 KB Created: 2021-03-23 07:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d1f7275b1dff1d8043e9c9f34d39e62 SHA-1: 517acf7bac1dbe2a3d54887fb222835bc721ecc1 SHA-256: ac20948d9ebb458f26d3bde177b4ea6079b0ed6f3121ad0f79cbbfbae37309bb
126 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, with one specifically leading to a suspicious domain 'botokaw.ru' disguised as a search result. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/strik?utm_term=what+are+the+benefits+of+corporate+social+responsibility
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5ff02eaaa263e.pdf
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/3645467.pdf
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5fd821cd481a1.pdf
    • https://cdn-cms.f-static.net/uploads/4379839/normal_602a3d77586a3.pdf
    • https://cdn.sqhk.co/tobepeliv/cjaWhar/blogger_blogspot_stats.pdf
    • http://pesuloduf.medianewsonline.com/integral_calculus_reviewer_asin.pdf
    • https://cdn.sqhk.co/nakunadubux/jgbWhga/merge_cute_animals_cat_dog.pdf
    • http://keniworu.mywebcommunity.org/ronevo.pdf
    • http://zawukinaloluku.sportsontheweb.net/biology_class_12_ncert_solutions.pdf
    • https://static.s123-cdn-static.com/uploads/4367004/normal_5fed3e851c756.pdf
    • https://cdn-cms.f-static.net/uploads/4468838/normal_602a140bdd3be.pdf
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/mabarovufaze-valewilok-funowaraguxugi.pdf
    • http://junumidutuzakox.getenjoyment.net/81584551069.pdf
    • https://cdn.sqhk.co/kogujipubap/hQrjaif/mental_addition_and_subtraction_worksheet_year_4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wulotugadag/teacher_intervisitation_template.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_cf8adc0308924887ae635d82fd9d980d.pdf?index=true
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_34cecd72fe2443d69791721b3b62001e.pdf?index=true
    • https://s3.amazonaws.com/dujepav/99493590527.pdf
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_7c3c84fa02034ae8a622083d99210fef.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_f115b3210c244d579e8e9995394e5f0a.pdf?index=true
    • https://s3.amazonaws.com/joterige/92309258634.pdf
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_deb0b00bdde849719816870074308b2e.pdf?index=true
    • http://pusapovewazigu.onlinewebshop.net/72883592360.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_off0001116a.bin
e53bea4069bf6cbc7e80b992cfb2a2b8df56a156f712a1c74e6666f880f73203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 5360 bytes
font_01_sfnt_off000123b1.bin
d949e95f8ce5d679246854ed5d6a14a57520093bb3bcae5e27390e06ab7d3743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 11128 bytes

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