Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1b93a7d07524b1…

MALICIOUS

PDF

62.5 KB Created: 2021-09-16 04:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a72ce0786817b8e3896445d7ab4e0a41 SHA-1: a9a5106b5056d3d8322e5fd56fb348f3047469f3 SHA-256: bc1b93a7d07524b13ca6b077aa8a5f3bd2dd102f45ef1d39447b27b9564179d3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

Heuristics 4

  • 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
  • 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://oniceh.ru/uplcv?utm_term=concrete+column+and+steel+beam+connection
    • http://sieuthivatlieuhoanthien.com/upload/files/13688153253.pdf
    • http://bainihu.com/upfiles/editor/files/83821495521.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/92c9521f3c7f3fa354d8c3093536b5d8/63396849313.pdf
    • https://hsdinstruments.nl/uploads/files/balazonalivexofadom.pdf
    • http://apcmagon.com/userfiles/ripukoxetuwogufus.pdf
    • https://rwd1.thadv.com/upload/files/41683751037.pdf
    • http://studio-castiglioni.com/userfiles/files/67465084429.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/45579893017.pdf
    • http://telecycling.org/files/file/vevegexeva.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/20638451326.pdf
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vefevoz.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/51090746876.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/13941717510.pdf
    • http://hqshop24.com/userfiles/file/79341484758.pdf
    • https://alley.52886.tw/uploads/files/51619167591.pdf
    • http://brava-ekb.ru/userfiles/file/64501542983.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/48509344475.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613538a2ee406---jewarafupejobogafejore.pdf
    • https://equimat-cheval.fr/file/rigunovojetinak.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/43938266268.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/72024390972.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///14048267292.pdf
    • http://trumoi-khutrung.com/upload/files/buduzeramorebaw.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16792 bytes
font_01_sfnt_off0000c85d.bin
1495bc59d74252cc0c0fd526a65718393bdfc7d735e16e4bb12a02cc4defd99e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 10800 bytes