Malicious PDF — malware analysis report

Static analysis result for SHA-256 33806e170195c5f1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 07:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d31bf52100d108e16865d70eda2cf85c SHA-1: ab941e5cca25e6dbec5144b6aacce55a1367bf16 SHA-256: 33806e170195c5f18e6f39524b24351edaa1b0fb75228863a2fc49051dded7ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on disposable hosting, combined with a heuristic for a visual download button, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=ice+scream+3+apk+mod PDF link annotation
    • http://seattlebestteriyaki.com/uploads/files/dituso.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/maxejosutobigiwe.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109131923013743.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/48370002259.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/35647967738.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/fefutefeguginaxigogije.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/35843470290.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/55401723605.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/87772423579.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/vutepomajoraj.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/mesawegodij.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/19347932688.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/3995306542.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/fabezirori.pdfIn PDF document text
    • https://km2804.com/ckupload/files/zovajisupamudixekabeb.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131619ae2162---dajuxalikewugibojajejokun.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zidif.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/14718792981.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zerusidumuwu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6312657432.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/35926779029.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e0b02255b592e3e5cdab406b24f12232/77920768784.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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 17524 bytes
SHA-256: c8ea33be367efd65b3c82f18cedec5925f4b98c78806729a253be15ce3a36681
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10552 bytes
SHA-256: 6ce3bebe62bda2909a5e22368ae18d34f0c24a3ad352ab00ae462bdc04c1dc3b
font_02_sfnt_off00012c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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