Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc045e7bbd0c5e9…

MALICIOUS

PDF

76.5 KB Created: 2021-03-01 14:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2229affdc15448b60e8206c8b815861 SHA-1: d56a8cd0af02d9cf73926744e29d9716a4968eb1 SHA-256: ccc045e7bbd0c5e9ace677f6f68f8fa8070034068348315ae13dfdb1a70acc07
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to 30 external PDF files, many of which are hosted on dynamic DNS services. One of the primary URLs, https://golowaki.ru/123?utm_term=drawing+pie+chart+worksheet+pdf, is likely part of a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

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://golowaki.ru/123?utm_term=drawing+pie+chart+worksheet+pdf
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/5826032.pdf
    • https://cdn.sqhk.co/rezejigobip/jjYMijG/my_boy_emulator_games.pdf
    • http://lixodamevurobar.mygamesonline.org/43963856602.pdf
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/7eabdb497b.pdf
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/9977511.pdf
    • http://xelasurugopu.mywebcommunity.org/wozorunevitixedovigu.pdf
    • https://cdn.sqhk.co/dutigimomana/dhgOgck/color_splash_fx_premium_apk.pdf
    • https://cdn.sqhk.co/rorazelesu/jhgEUcu/43503300501.pdf
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/9004381.pdf
    • https://cdn.sqhk.co/xovatagemi/9EDggIR/tap_tap_fish_marlin_cheat.pdf
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/3268821.pdf
    • http://lezigovedavide.getenjoyment.net/sutogagoj.pdf
    • https://cdn-cms.f-static.net/uploads/4392861/normal_600aceb2d629c.pdf
    • http://pelinebaj.mypressonline.com/denamafu.pdf
    • https://cdn.sqhk.co/vizelupavew/hdujgrq/samikevizel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jemileti.atwebpages.com/1536856446.pdf
    • http://wififeju.atwebpages.com/pamewosuxudonisunez.pdf
    • http://tulajadulixo.myartsonline.com/tuzazemosonivejumumuzi.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_off0000d5a5.bin
c504557e67ba5ef097b774f727cce34f89d1e4a6a43469abea041f81667c1081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 5540 bytes
font_01_sfnt_off0000e892.bin
fe0433e807b9d1b98a4a39f7a7703dee39b050dbf4b5b1a711115a06a9eb2fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 11096 bytes
font_02_sfnt_off00010e96.bin
387a27e829cf18e3861ed30809f443fba21d53c68951126922a0b9e28c8adc6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 16424 bytes

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