Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d8a24dcfad0d22…

MALICIOUS

PDF

92.4 KB Created: 2021-09-14 12:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d2afbf7926c48743d724b41d1901dd6d SHA-1: 8d73b1808de0f05cc03068e7fae39a08f86ef84b SHA-256: 04d8a24dcfad0d22a6c45bb34ee6b46c0c338a1862ce8f191e2912138f27849e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://seyrimerdin.com/userfiles/file/17644251042.pdf In PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/5609189434.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60829988998.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/filinosugotiwegutupaf.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/44728750374.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/foxujemabifox.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/wezubinekikesovibazesofen.pdfIn PDF document text
    • https://ambalatender.com/upload/files/12060471164.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/bemetewopuronazigatadi.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/denapavenesegip.pdfIn PDF document text
    • https://actorconseil.com/files/file/nevuw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320b40488db---10214796707.pdfIn PDF document text
    • http://www.pvvc.cz/files/zotopedonegadavufozuzelam.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/jatibotozivuperij.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5662599432.pdfIn PDF document text
    • http://grabnerestriche.at/sigam.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/potemutegifodejop.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/91110420977.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/tebukosajunadedut.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b04bfdbc---15233981997.pdfIn PDF document text
    • http://afslab.asia/upload/files/bamapimeruzezusojokebelap.pdfIn PDF document text
    • http://dsraxys.com/uploads/69113430373.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/basegetuforatokuxabat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+to+write+in+subject+in+mail+while+sending+resumePDF 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_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 11264 bytes
SHA-256: 7e69bfc53f8c106994997c90f0b036d644f71a26d15c40fd00113c9e28bc5420
font_02_sfnt_off000133bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BD 18492 bytes
SHA-256: 158ac22128c824bb43a0522b46a2d6b952ca2f11779458070a02a6f84e73ea91