Malicious PDF — malware analysis report

Static analysis result for SHA-256 37956040f4a72a4b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 18:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c61b9b30b4967713637cdbd0faac93f4 SHA-1: ab0c8eaf3e48e493ae045590d54bf269684be2cd SHA-256: 37956040f4a72a4ba654a39c78abcd4161569f1ec2cfb29c128149121193a86f
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDFs on distinct domains, likely to obscure malicious intent and evade detection. The embedded URLs, despite some being marked benign, contribute to the overall pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://haliburtonhighlandsheritage.ca/userfiles/file/82603755007.pdf In PDF document text
    • http://1careglobal.com/upload/files/kusabilidemuvojebozabap.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/85198332632.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/94451463457.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/69457524569.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5981c03231a272151a85c0ab59ffd160.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/biwudufa.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/14779200779.pdfIn PDF document text
    • http://baove24h.org/upload/files/83113087040.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/midita.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/rexeritikomomib.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/86505497803.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/19595684328.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/xumikerinipuza.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210907_F4E03D9A0577CDF5.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/58389601597.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/digelipuvuxudujisebidatab.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/aeebe83ff08ace398a3e697e070e49c1/34222633327.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/93198077432.pdfIn PDF document text
    • http://chinalabware.net/d/files/57016857556.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/13166161619.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/32570490494.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d1e62d90442318af058651448c28f80b/75901521611.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/61372795194.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/76723392511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=perawatan+luka+gangren+pdfPDF link annotation
    • 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_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 10572 bytes
SHA-256: 507720284526ea9adad7cf090030ba9283af9ee6f99e5cf827b90595449e7967
font_02_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16640 bytes
SHA-256: 1c1504967fe2985c267d22e67bbaf7275a91598939309037f30228bac7056e23