Malicious PDF — malware analysis report

Static analysis result for SHA-256 3998dcfec1974d26…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 05:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2edfc6403bce637e80564e9721f3465c SHA-1: d3055ec3a63637dda7fb5e0fd989011a13fe5543 SHA-256: 3998dcfec1974d262ed3df3ad3d10d88d4fdbda0b612fe990c7848c08a9dae61
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary purpose of directing users to download other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to trick users into downloading further 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=the+a.+b.+c.+murders+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5fd7b3ddc23f6.pdf
    • https://kevewejisarugi.weebly.com/uploads/1/3/4/6/134611403/2050339.pdf
    • http://efarbok.xyz/85739092572o2b6a.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_6026e2d49d6a5.pdf
    • http://vilopeg.xyz/singer_touch_and_sew_7462_reviewsjrmm9.pdf
    • http://tibudirowe.mygamesonline.org/vapukubukuto.pdf
    • http://gagogepatajebe.medianewsonline.com/reznor_heater_sizing.pdf
    • https://cdn-cms.f-static.net/uploads/4411944/normal_6051cc2bf3071.pdf
    • https://cdn-cms.f-static.net/uploads/4424378/normal_6055b1cfed199.pdf
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/poputajalij_wimatusilowu_perot.pdf
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/aec5416e92489d.pdf
    • http://future-techno.ru/how_to_make_residual_income_online578tg.pdf
    • http://tojuvapemupo.mywebcommunity.org/walekakaxan.pdf
    • https://cdn-cms.f-static.net/uploads/4375504/normal_60402eef08a4a.pdf
    • https://negipefit.weebly.com/uploads/1/3/6/0/136054485/jijukojam-rupagifegom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pixafur.atwebpages.com/pumerabirova.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_49768bd743a345dc8f4ea34e15662ec3.pdf?index=true
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_f51bcc601bea4dccae8da0ac72113a04.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_750ab27d696043c2a8b63ab795d6b592.pdf?index=true
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_c2632f2dd8824cf98ff100207b122b5c.pdf?index=true
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_2c5f7ac4f8424d069705436851e0e80c.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_off0000f148.bin
c4ddc9093a8550de9392007222d2e34d2ddce02781fa60aaef3e446915274f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5608 bytes
font_01_sfnt_off00010440.bin
a436a222ae55b45f8da7caf1053e669432dc07f7667d70ecd722474cc8d51fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10656 bytes

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