Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c234112528c744…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 18:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12d77ea71a9e767dcb495bbff791de4a SHA-1: b365184159dee316a8b52f88598abbe30be7b1c8 SHA-256: 59c234112528c7446504657e1d4d6a28700521b3b06b3d007c12a464f62307ff
136 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. One heuristic specifically flags a PDF link to an algorithmically-generated URL, indicating a potential phishing or malware distribution attempt. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3891

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fsnmmaterials.com/UPFILE/userfiles/files/jodofilazedonuzesazufol.pdf In PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/50361668117.pdfIn PDF document text
    • http://195exim.com/datas/files/zimajuj.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_EC6F14335A836F13.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/fikobesagaloboliboxuloxo.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/19533681938.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kirexomax.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/44245641461.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/43209749961.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/suzeji.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/19064975187.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/48737701892.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lifasakapar.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/titiwilelufudurega.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/41188700486.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629e55b09---bevifamenodu.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/72492276996.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/20726165924.pdfIn PDF document text
    • https://media-get.com/userfiles/files/nexagupuvogatakagakuzap.pdfIn PDF document text
    • http://pileki.com/imgup/file/55594773320.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/46636443415.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/wuxewe.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/1810328354.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/37639418124.pdfIn PDF document text
    • http://space-edge.com/upload/files/dupawusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+unblocked+site+2020PDF 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_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 18232 bytes
SHA-256: db66e1fe4c7461136012489c167bedec217fda44010e4f3b24bd4f8ef7fd30fb
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 11036 bytes
SHA-256: a6a7e79c7e008ac53338b50398672cdf932ab412df95fbca618dad43cd6604ff