Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d453429e492a48a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a987f698309d767275922a1057c86dd SHA-1: 740f7482785d084277d5cf5fadcfd63d0b6ad622 SHA-256: 8d453429e492a48a2707ce0636feb92dfa678358daf5274352ef164e1872da86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=dead+zombie+games PDF link annotation
    • http://kozszemle.hu/uploads/files/22047012238.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/96234671998.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/pomizikuvoton.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210922_161307.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/63188197730.pdfIn PDF document text
    • https://intersat.lv/files/file/fujanadipidudewo.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/45038346089.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebac3e5409---vopubopukolafasezuf.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/79401450015.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210902022559_vapy5d.pdfIn PDF document text
    • http://stonebreaker.at/20826279380.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210914044519.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/2914983895.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/79910895839.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mudoveruwilunukab.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/82184884190.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/44196503800.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/87205821102.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109081357255535.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfbb54bf52---84430700953.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/30595776916.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mizozixapozesirejudeviki.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/tusadoxebupagedetoneke.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/57328643948.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 10444 bytes
SHA-256: b87c7f5149564fd8e735dbdb42fb85bad8f2d78b63ea83c1d1d651dd8567c924
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 18160 bytes
SHA-256: 18aeb6d25a5f2bb8f07821a7d8bb059c1ea58156a6e26ad44ef452db87aaa26e
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1