Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a151fd925c3eb3a…

MALICIOUS

PDF

71.1 KB Created: 2021-03-27 18:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3120f16f9e115e12b53d231dc56a2ca3 SHA-1: c7f973276dc7539262bee9b7b71af1622000061d SHA-256: 6a151fd925c3eb3a9ed5d886b3582c917f47fa69b9e8a3c5df48031699d513d8
186 Risk Score

Malware Insights

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

This PDF is identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, contains text related to exam results, indicating a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=chittagong+board+ssc+result+2018+with+marksheet PDF link annotation
    • http://ponemofetu.scienceontheweb.net/nipotevejepo.pdfIn PDF document text
    • http://about-fb-support.com/burufogeparug1rzua.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fccdc6aeefc7.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/hE0shjh/teenage_mutant_ninja_turtles_rooftop_run_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/bzJhdgj/jekepiruxatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_603b045d03690.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/gjbihia/54314452234.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/9913592.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/3892796.pdfIn PDF document text
    • http://muzoc.xyz/minecraft_apk_0._15._0_free_downloadkyq06.pdfIn PDF document text
    • https://womarunere.weebly.com/uploads/1/3/4/3/134315700/7232215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_6052fcef402ae.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/rRgeoij/zipawadusomigolemobowez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453327/normal_604e89e2b2b99.pdfIn PDF document text
    • https://xasizati.weebly.com/uploads/1/3/5/9/135978204/c8ad27c4d3.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/chilton_auto_repair_manual_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_604ef27abebd1.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/Z1ihYV5/football_team_manager_app.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/2f17beaad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 6072 bytes
SHA-256: ced22486de9c517ac8cbdb8099bbc9d0d0e31f839d2f0d9271d4c0c401d056e5
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10700 bytes
SHA-256: ddd56b4e84304f344aa8d751e2e5e01d4ac3700f7532af6056a1efb6c657b949

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