Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c1389b5b72da7f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 18:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb9776e9d25040132c8b4c504989128 SHA-1: da7359af80d5827a0a8e3828de2d607b388c114e SHA-256: 73c1389b5b72da7f8d560178ed611925590eac1a73ea7e60182756c5e654c93d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which are flagged as part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://fsnmmaterials.com/UPFILE/userfiles/files/jodofilazedonuzesazufol.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/50361668117.pdf
    • http://195exim.com/datas/files/zimajuj.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210912_EC6F14335A836F13.pdf
    • http://nuovartea.eu/userfiles/files/fikobesagaloboliboxuloxo.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/19533681938.pdf
    • http://gdlianyu.com/uploadfiles/file/kirexomax.pdf
    • http://ageofwonders.buka.ru/sadm_files/44245641461.pdf
    • http://viswinkelindex.nl/images/uploads/43209749961.pdf
    • http://alocainghien.com/uploads/userfiles/file/suzeji.pdf
    • http://gzmzwl.com/Uploadfiles/files/19064975187.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/48737701892.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/lifasakapar.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/titiwilelufudurega.pdf
    • http://www.radio-kum.si/data/files/41188700486.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141629e55b09---bevifamenodu.pdf
    • http://market-oborudovanie.ru/upload/file/72492276996.pdf
    • http://hoinhikhoavn.com/img/files/20726165924.pdf
    • https://media-get.com/userfiles/files/nexagupuvogatakagakuzap.pdf
    • http://pileki.com/imgup/file/55594773320.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/46636443415.pdf
    • https://ambulatorioveterinariosismondi.eu/file/wuxewe.pdf
    • https://upbilbao.com/ckfinder/userfiles/files/1810328354.pdf
    • https://kiaavcilar.com/upload/ckfinder/files/37639418124.pdf
    • http://space-edge.com/upload/files/dupawusu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+unblocked+site+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c146.bin
db66e1fe4c7461136012489c167bedec217fda44010e4f3b24bd4f8ef7fd30fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 18232 bytes
font_01_sfnt_off0000f070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 16792 bytes
font_02_sfnt_off00010887.bin
a6a7e79c7e008ac53338b50398672cdf932ab412df95fbca618dad43cd6604ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 11036 bytes

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