Malicious PDF — malware analysis report

Static analysis result for SHA-256 712c60ce96799637…

MALICIOUS

PDF

66.5 KB Created: 2021-10-03 09:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 191f3406828633212d2d379f3fb17144 SHA-1: ec88e01a92c6e4074e39993ce981a106e0b302ef SHA-256: 712c60ce967996373783d9c6e4f582ca86640a452e510b5e6593a87892cbcc9a
146 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It is an image-only document designed to trick users into clicking embedded links, which are numerous and point to various domains, suggesting a link farm or redirection scheme. The presence of multiple unknown URLs indicates potential distribution points for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5307

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 66 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://rudolphi.nu/userfiles/file/91004111036.pdf In PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mrkcjb0hqgs06qr8s23dug00a7/jipozuxukowiwunobagij.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/53220739695.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/14522682164.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/28288554116.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/39188938874.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/83804497447.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/95177040792.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/de628de56f6633a06e8cdaf8169c25cd/fekobonizogamono.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906121038730763.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/gekudizurusep.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/tewidemabirimorema.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/35524921.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/nafumor.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/jinisedipepu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/99241481076.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/ratewagozaruwav.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/1023535548.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/bopuxudakiluxu.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/2920501520.pdfIn PDF document text
    • http://i-physiology.ru/upload/nepetoditafazavajaripoxa.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/wewelufulibaxumovurokod.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/82525327273.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/konuxapipunojek.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/duguwusaguruzibuzisitofil.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/98659141217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ridiculousness+terrence+jPDF link annotation
    • 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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 14228 bytes
SHA-256: aebd72acbf5dcc4edf828d257118c5be2f08641f5c263319b5dd60610eefbcdd
font_01_sfnt_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 10476 bytes
SHA-256: 9f215146ac6fb2d379d35d87d6c5623d9dc41f5a058e29b6ee4abfdb3856a8b1
font_02_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1