Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6b4232576d5590…

MALICIOUS

PDF

72.4 KB Created: 2021-03-19 19:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01aec6f0f8ccdd564aa79b439af67d03 SHA-1: 5fb6d3aacaa4c5f42ea4a97d272a7efd16d9c74a SHA-256: 5f6b4232576d5590e3d7abbb27cb743ab5ef3aa4b6c67a0030a7b8a80ef71177
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to zajinet.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'vocabulary workshop answers', aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=vocabulary+workshop+level+f+unit+5+vocab+in+context+answers
    • https://cdn.sqhk.co/kiwapipu/hF0gjfR/workshop_definition.pdf
    • https://takoremitivo.weebly.com/uploads/1/3/0/7/130738963/totefuwi-dokoxez.pdf
    • https://cdn.sqhk.co/darojopul/ibPhbBg/72372717751.pdf
    • http://mufosubofamar.mywebcommunity.org/how_many_calories_in_a_slush_from_sonic.pdf
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/6bd673856c22.pdf
    • https://cdn-cms.f-static.net/uploads/4416664/normal_604ad539da25a.pdf
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fe1d05313903.pdf
    • https://cdn-cms.f-static.net/uploads/4451755/normal_6019982a340d9.pdf
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/c0ad0.pdf
    • https://cdn.sqhk.co/mazasofuw/cjujiNR/76845850181.pdf
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fff77924aae2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73e694bd-6bf5-424a-935d-444bf8ae9db6/my_samsung_tab_wont_connect_to_wifi.pdf
    • http://rilobun.rf.gd/business_code_of_conduct_template_uk.pdf
    • http://masokijedeneda.epizy.com/17985413987.pdf
    • http://jalebuvubo.myartsonline.com/40575206610.pdf
    • https://uploads.strikinglycdn.com/files/1c362e29-c963-4a08-8842-ec1f3eca46db/93114064219.pdf
    • http://pumamolo.rf.gd/18356020325.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_off0000dcf7.bin
6baf53749610624df700a18c1743ee0fe71f4a98a2ad2012f4b7feff1f9e0c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF7 5716 bytes
font_01_sfnt_off0000f08d.bin
4d82e71a2976a5c99e813415e75573996bbd96d657cb6a9d9c3e5691c56c265f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10492 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.