Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2196b43562c3ae…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 03:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37b6b0506834d7c79cdf604e021082a9 SHA-1: 9fd6f47b75708c745b6dc153dc1769b00ce2dd43 SHA-256: da2196b43562c3ae51d3e274b6f197f9bcb03f2c60bbc3f4e558ba2b4aedab30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself can contain malicious JavaScript, and the presence of multiple external URLs points towards an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://slovbau.sk/test/userfiles/file/zulixoputepitaresatadu.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/96258a1350c5192cfdb3bf979abc640d/dabufujiwebezo.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210905142051625654gwktx.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/17601673812.pdfIn PDF document text
    • http://kelvista.lt/images/files/97654716022.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/21092230141.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/movimorutoregufola.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/xivojenipetivu.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/5996355541.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/50765303341.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/15094571282.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/vilinudanuromiride.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/28100971294.pdfIn PDF document text
    • http://tid.vn/upload/files/41540053099.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/dofutam.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/39312399783.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/61330899862.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/susul.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090806185473499.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/26236162748.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nubabimajujuzimodel.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fepawidufikudolodikir.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351ef84f140---jarafeda.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/16348860417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+wifi+texting+on+androidPDF link annotation
    • https://b2cdemo.tickets.com/content/files/36200320076.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_off0000c4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 10492 bytes
SHA-256: 5ddeee19005c838194a347c51cdb925c17518eafc1269ddaf6f5ec94eaf96983
font_01_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 17296 bytes
SHA-256: 9c4f05a547a60ee8dd04e57f5cdce6196535ed0d2672eb2692ee939e1434f021
font_02_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1