Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30c7fd11bb348d1…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 19:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 26f25c5df18d0b19b80da45cf984fe17 SHA-1: 508b05b16eae7e74ef6a458f762b51ccaf82df9c SHA-256: f30c7fd11bb348d17be7414a1d6eae9c63bad400176370534ec93312abf939db
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, typical for directing users to external links. Numerous URLs were extracted, many hosted on potentially disposable domains, suggesting a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cosmik-kinoteatr.ru/sadm_files/53127502238.pdf In PDF document text
    • http://yhbinternational.com/userfiles/file/19476260323.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/95448681320.pdfIn PDF document text
    • https://reha.bg/content/upload/file/97329149418.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/36304780796.pdfIn PDF document text
    • https://granitnet.hu/editor_up/70595129223.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/gejalokujovela.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210903063211.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wabopiv.pdfIn PDF document text
    • http://candientushinko.com/images/file/16455344885.pdfIn PDF document text
    • http://cascad-trans.ru/files/nonubamisupuf.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/tanikifexefak.pdfIn PDF document text
    • https://qnzar.com/files/70779470696.pdfIn PDF document text
    • http://195exim.com/datas/files/wiguvexevibeta.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/65446449861.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/fikiviporuroro.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/43465506705.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/37046499916.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/jofedefekuj.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/gedaxajaxujuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0352f979---90629275554.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/nutixukimuvirajit.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210929_74578AD833A53A60.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chow+chow+mixed+with+labPDF 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_off0000b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 10624 bytes
SHA-256: 816b1d96482056f8c8fe2818b560278d81672e1da63ebf4bb780fde0615745ea
font_02_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 14032 bytes
SHA-256: 2444152e7a1b9a8274a468516d0f7ab0e47b57f18ca3b36c65ec65e58820ef33