Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e288985638eecc6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 07:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e492ff88ea41931625463823095329e2 SHA-1: e54f3980ed1ea74b18c9ddcd405719ad76fb55e9 SHA-256: 8e288985638eecc6ddd6a218d08ab371d8e8249774684b1114d06370067aa2db
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://oniceh.ru/uplcv?utm_term=4+movierulz+2020 PDF link annotation
    • http://probeg2000.ru/files/userfiles/files/rilerurol.pdfIn PDF document text
    • https://akvaguru.hu/user/file/jovejuwuvag.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/63569074409.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44dd1fd6e---dimuvujodofiwikamitep.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/wiwazekodugosaw.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/lazesivumexoviteze.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/85456525883.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914102333.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/52172602166.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/joweb.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/40245196989.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/95211959826.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/mesigeliriladu.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/94160704719.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/46406939443.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/91601924131.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/xakobuxulotipino.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/31180751957.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/buwigolidaxakiririduje.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/84012582244.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vonavezijexivejelubo.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/vijifarajetazeri.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/nufuxafijexi.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://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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 10188 bytes
SHA-256: 85c2bab0797917da1bfe7ecd77adf91d52cf14159e2a8e7e20fd45abb81e51c3
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16588 bytes
SHA-256: e994dd8eeb108719a934c96783a031c6877fae6140183a560e8cefae2e06bff0
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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