Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4802cead3a91c0c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 04:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cbd0ce3fef281c31636add05b60a2d4 SHA-1: 83f83d43b7f4583ef07fa7f9fe0b0a9f1c49bd08 SHA-256: f4802cead3a91c0cc6762a0a7e615d8ac04facd61cdfb14777aa308a1355aa00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crewmak.ru/uplcv?utm_term=best+app+for+mobile+to+pc+transfer PDF link annotation
    • https://kingwaterpure.com/ckfinder/userfiles/files/44423882784.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/jamisekilivabu.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/14381728955.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sujitagapazi.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/64543454358.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/89512064474.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/fegatugisigelagizerovesej.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xanuwalutoruziputetenub.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/waloseda.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/74310881260.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/besajaf.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/61346813063.pdfIn PDF document text
    • http://edeins.com/userfiles/file/gabulipagabosav.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fogefiserudaf.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374c3ace27a---vizesopopefuze.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/13753004374.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30161168409.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/66463871595.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109041147201621.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72495849198.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142967c74ba5---35435645173.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140303228603.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/gibufegaruso.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/wokirojodonaniwir.pdfIn PDF document text
    • https://oasis-travel.ro/files/29644439099.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 18736 bytes
SHA-256: cc17a364b428c40ecb6f2a340ba3fbcaaf48312b0c23cd2467ac5b9bde5d7b6c
font_01_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 10832 bytes
SHA-256: 11108c88e2de5491480fc11f64ce6ed90987d45602da9aa5e262a6ef9113b5b7
font_02_sfnt_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1