Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0974909f1dabd8…

MALICIOUS

PDF

84.1 KB Created: 2021-04-03 15:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 046a6fa3118ac72014ef0b3e9c9dd0cd SHA-1: b508e250f663c64db5033ea29eef0e6dc64c9a16 SHA-256: 3a0974909f1dabd8f99a86c35acecc5457feade9031181d8f39b79bc1f156045
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in phishing or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support the conclusion that this document is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=hounds+of+baskerville+sherlock
    • https://cdn-cms.f-static.net/uploads/4459926/normal_601c75f1629f1.pdf
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ffcc32c4ddca.pdf
    • http://kismykeitio.best/review_sheet_mask_innisfree_aloe_verarfvtb.pdf
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6029ed6945c27.pdf
    • https://cdn-cms.f-static.net/uploads/4464850/normal_603dcb076b1b6.pdf
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6058fd8a7c7e6.pdf
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe4e076b6d8b.pdf
    • http://podcard2020.site/willy_wonka_and_the_chocolate_factory_dvd_release_date44iqe.pdf
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/6274361.pdf
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fcfab2525677.pdf
    • https://cdn-cms.f-static.net/uploads/4370092/normal_6029466f010f0.pdf
    • http://freefire-gifts.com/63916584699ioi46.pdf
    • http://kanubanedagag.22web.org/90323055740.pdf
    • https://cdn-cms.f-static.net/uploads/4469641/normal_603046de6ea4a.pdf
    • https://cdn-cms.f-static.net/uploads/4445739/normal_5fd3a89f2fbd3.pdf
    • http://copytoshka.ru/212750778258rmhw.pdf
    • https://lewuroluloxujul.weebly.com/uploads/1/3/4/6/134678017/4582435.pdf
    • http://xafevak.iblogger.org/kufelesuved.pdf
    • http://mnogoturov.com/70746021301zmv0t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pexoroxijaseduj.rf.gd/the_sign_of_four_1983_ok.ru.pdf
    • http://lanadofebanubod.epizy.com/surah_mulk_with_urdu_translation_mp3_free_download_qari_abdul_basit.pdf
    • http://mutifitiwexo.epizy.com/64969451564.pdf
    • http://segixiw.epizy.com/42231562276.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_off00010c95.bin
49f51e673d7695f4ea02efb2e2fb7752637ff6782d04b65fbcb54294ff9a5422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 5332 bytes
font_01_sfnt_off00011eb6.bin
822eb0355b631ddddccdd3bbc408d59288ef945c02e457e98127490b2127515d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 10596 bytes

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