Malicious PDF — malware analysis report

Static analysis result for SHA-256 51907d6d8ddee573…

MALICIOUS

PDF

127.1 KB Created: 2021-03-21 12:17:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 896d88a65bf78bfd1e5c09291c9840a2 SHA-1: bbed0a263ed83a8d01648e344768a40108a2234c SHA-256: 51907d6d8ddee5730f4c76b97e61359e05d370b1ffef3fe23ad8034857815a0f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary malicious URL identified is https://nipisod.ru/award?keyword=myocardial+infarction+pathology+pdf, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=myocardial+infarction+pathology+pdf
    • https://cdn.sqhk.co/xozawimepod/gigficH/41075962440.pdf
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/budejixe-wawobugovilibe.pdf
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/d0bff6.pdf
    • https://jewadasin.weebly.com/uploads/1/3/4/6/134604584/waboz.pdf
    • https://cdn.sqhk.co/nezosomoji/cLYvdhg/59079951930.pdf
    • http://italylife.pro/mary_shelley_frankenstein_free_movie_onlinekjgkb.pdf
    • http://kittyplay.online/kuwimubuwarekuduwetosdvvd8.pdf
    • http://sunny-web.ru/cut_the_cake_lyrics_average_white_bandhbhn4.pdf
    • http://zavifuvalo.22web.org/intervention_theory_and_method_a_behavioral_science_view.pdf
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/linop.pdf
    • https://cdn.sqhk.co/vuritukupus/IjjWhh3/easy_2_load_trailers.pdf
    • https://wesafave.weebly.com/uploads/1/3/4/3/134307961/984501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a38cc97-bdd0-4338-b6bf-0e16d1a99554/68815921721.pdf
    • https://uploads.strikinglycdn.com/files/d3b79e36-cba6-4e22-9b7e-28c8d710449c/how_much_is_a_transmission_for_a_ford_ranger.pdf
    • https://uploads.strikinglycdn.com/files/b9f6359c-0de0-4460-b677-50e137fca251/91598624519.pdf
    • https://uploads.strikinglycdn.com/files/e7fe2cd8-98ff-4cb0-bc2b-6937796744e8/batch_code_commands.pdf
    • https://uploads.strikinglycdn.com/files/af434635-0a3b-4567-a118-019fe7ce4880/fodazaritaxubamubeparup.pdf
    • https://uploads.strikinglycdn.com/files/d36f9069-fcc5-48b0-94a9-5e9c94991dae/95808431744.pdf
    • http://ninesunugata.epizy.com/8254423601.pdf
    • http://tidukuj.epizy.com/dazexegubapokutowizixo.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a02e.bin
223ab9f3a62f520d96d52d2dc9355e0efefc32f34ea287c6fd51d96bd0434a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A02E 5348 bytes
font_01_sfnt_off0001b273.bin
6654b4b86e09318c42ba5cb5d0a2c44a1e2a7650e16c91d27e15b96611184f41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B273 11528 bytes
font_02_sfnt_off0001d930.bin
98bbda09e34957c2c47eea570891e411fa41ced272e9777bbef021ce7395b75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D930 16148 bytes

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