Malicious PDF — malware analysis report

Static analysis result for SHA-256 9539b46f02f5afc6…

MALICIOUS

PDF

79.8 KB Created: 2021-03-09 10:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 029a91ff39b54b351528e28e27c2d5f4 SHA-1: 7c4db4d0a3bea7169926f14081887f771767e280 SHA-256: 9539b46f02f5afc6764652c6b9b7b4c65d3843293ea392e1474a9604ded7eb70
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its immediate purpose beyond the presence of numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=braun+thermoscan+7+user+manual
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fd8174172d23.pdf
    • https://cdn.sqhk.co/gujuvizaja/iqgWKGh/music_sticker_png.pdf
    • https://cdn-cms.f-static.net/uploads/4405443/normal_602b47d4872c7.pdf
    • https://sagudazotimoja.weebly.com/uploads/1/3/4/7/134753003/womekub.pdf
    • https://cdn.sqhk.co/rivotoxupow/aQE4Big/cycling_bike_tracker_zeopoxa.pdf
    • https://cdn.sqhk.co/kekotenonaxu/hhfhilo/wesonez.pdf
    • http://siwarezowagi.iblogger.org/tosexasaratuladuvubilaki.pdf
    • https://cdn.sqhk.co/tivuzofep/dicygfm/8289684633.pdf
    • http://dasiroxejipi.22web.org/lupawizirak.pdf
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/vurelunuvefim-lisizuzo-fadejum-fenoku.pdf
    • https://cdn.sqhk.co/baxikomo/jgjepij/game_brave_fighter_demon_revenge_mod_apk.pdf
    • https://cdn.sqhk.co/jigugabopu/jqmLicY/aula_de_violo_iniciantes.pdf
    • https://cdn.sqhk.co/kefekawit/jbrUhi3/billie_eilish_lyrics_everything_i_wanted_deutsch.pdf
    • https://cdn-cms.f-static.net/uploads/4460473/normal_601207d4803ac.pdf
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5fe7e828bedaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_7858e16d880e479086b57d50e019438a.pdf?index=true
    • http://ruleruz.epizy.com/naxabuwatolopigugovademu.pdf
    • http://xujiwusa.epizy.com/dha_bahawalpur_form_last_date.pdf
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_bc99ab32d806418b99b95a3915c24661.pdf?index=true
    • 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_off0000fb18.bin
21ac4d6a448d78feceb21601562c00e02e3fabfc7989b640fba0802c007f74b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 5168 bytes
font_01_sfnt_off00010c82.bin
c9f9e78bf3a65adbcc5844564f40a02282c8426f4a422d2f22d741614858582f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 11164 bytes

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