Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c75038453b6b37…

MALICIOUS

PDF

74.8 KB Created: 2021-02-22 11:29:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6fcb59bbc27a17817721c398fb2ecb26 SHA-1: 067f7c28848c9eb6bab72f0f9ba7254ca6d7143c SHA-256: 14c75038453b6b372d6864e2ce66d8dd90877ec0ce8b96577879d7f9c7ae35bd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. Heuristics indicate a lure for browser extension installation and a fake invoice, combined with a high ML classifier score and ClamAV detection, strongly suggests malicious intent. The primary URL, https://jacksth.ru/123, is likely part of the initial infection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/123?utm_term=wildgame+innovations+camera+2+pack PDF link annotation
    • https://cdn.sqhk.co/zezegawutogu/hfvjeQh/football_fitness_training_program.pdfIn PDF document text
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/9214527.pdfIn PDF document text
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/boler.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/AijXjb8/irancell_apn_ios.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/4156759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445743/normal_5fef4a846b60f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394068/normal_6006ce21758c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378167/normal_5fdfa8ede7b31.pdfIn PDF document text
    • https://gapemudumowew.weebly.com/uploads/1/3/1/4/131437765/4374524.pdfIn PDF document text
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/384095.pdfIn PDF document text
    • https://cdn.sqhk.co/jeposanop/cXiipjb/angry_crab_shack_yuma_az_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/59128856007.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/modosodigeduzajet.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/idsa_guidelines_fungal_prophylaxis.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/86234075973.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/norimanatusobidemupeb.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/lg_g2_mini_d618_hard_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/24806442412.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/32661385091.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5664 bytes
SHA-256: 3ceeb5502d0edf9fc5b0377c1294bec5d60008c3e590fb8d672c69293bd0e2b5
font_01_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 11588 bytes
SHA-256: c8b7a1fab6902bba50201f94650bd07b8b73f6c1c06dc00d5c809f69dcede053

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