Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca8df7da0cddee…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 12:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0734aafd0d43ee2b62ac9ee8d4c834d2 SHA-1: 40c72b4eae7a3ca3ba730e9233b8f8829937630d SHA-256: 41ca8df7da0cddee7b88d0677438b45a1de1b48bba11431e3c536c39b5325c0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=role+of+forest+in+carbon+sequestration+pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/kusadam.pdf
    • https://htchninc.com/d/files/pozulolewezudamimevazaleb.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/mevedesal.pdf
    • http://qazaqbanki.kz/data/content/files/30344086065.pdf
    • https://alakharia.com/public_html/userfiles/file/27928555790.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/58406580519.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/1611154407.pdf
    • http://runhouchem.com/upload/files/zawiv.pdf
    • http://tuanayapim.com/rsm/files/febumulagunobowiweroxu.pdf
    • http://miet-boot.ch/images/uploadedimages/file/78177866464.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/32512070767.pdf
    • http://zit-tech.com/userfiles/files/wutas.pdf
    • https://newtech-utm.pl/userfiles/file/nowolezasipuk.pdf
    • http://faurau.com/luodan/images/userfiles/file/38041172400.pdf
    • http://carbontuning.ru/file/zisasifisig.pdf
    • http://kibbkw.com/uploads/file/mikosijo.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005cbc66b2---87198026178.pdf
    • http://hide-bo.com/img/tmp/file/lugizirokadunodagosudum.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/558d6c3733f25877da7c5f07a7296860/fisisosubagovef.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b5abcfd5f5e84a7ea8d723cd95d1e6ed/povusekiro.pdf
    • http://spreewaldatelier.de/img/editor/file/63880712029.pdf
    • http://hzbmsj.com/images/upload/File/befemo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3c.bin
7af2f5eea1f43e5bb928d99a8866b5ab19c8c0fa682a0b38308b9255275ecae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3C 18064 bytes
font_01_sfnt_off00010a34.bin
15281d4aa3377f430cdbe6cdefe513be61d355ff94e66637c9d3e50e78bdd84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 11044 bytes
font_02_sfnt_off0001239b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes

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