Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36d82aa756cdf69…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 06:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adf66e77412de0017563e2a6aeb279c3 SHA-1: ce228b7a79e70a425ef24222d6a8663d3026939e SHA-256: c36d82aa756cdf6982b62b5bc89c3b1cc7ab3bd6060361e3506ef92b1089cfc3
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The document body, though heavily obfuscated, suggests an attempt to disguise the malicious links as a supplement store advertisement, likely to trick users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://renknh.com/ckupload/files/sudilumikakajenujawiv.pdf
    • http://adec-interiors.net/Uploads/file/77908778967.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ee50eb2effe315688b7f67971814926/43304772105.pdf
    • http://dolekkoyum.com/admin/UserFiles/file/volewanap.pdf
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/salewasudiligab.pdf
    • https://jgranit.pl/userfiles/file/nujobo.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdf
    • https://beauty-full.ru/uploads/files/mapixuvezegavitonefajap.pdf
    • http://feriaalainversa.com/uploaded/files/fibijanavoverusarume.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/wenuvogefalodekiz.pdf
    • https://jxlmedu.com/file/files/20210906_180757.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/rewesukiderawefamomivi.pdf
    • http://charmingcurls.se/upload/file/wowulekojubimofetasojumi.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/rixakovimuzimedinajew.pdf
    • http://baugeraeteverleih.de/benutzerdateien/49172794108.pdf
    • https://hankilfood.com/userfiles/file/20210906223520.pdf
    • http://vrieshorst.nl/images/uploads/file/84364145904.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b10c51bd2---wosawe.pdf
    • http://digilit.ir/basefile/digilitir/files/xodotibomodowogugigikokof.pdf
    • http://dailymaydemtien.com/userfiles/files/tibina.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kovilabuli.pdf
    • https://apra.pl/files/file/60715942309.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99482101900.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/wekaguzumogetuzaxas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=supplement+store+wetherill+park
    • 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_off0000d3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 16792 bytes
font_01_sfnt_off0000ebc7.bin
f83984b77f555e88220986dbbbd62daa8feb71ca805f5affe7e13b3dc85f011a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 10872 bytes
font_02_sfnt_off000104b5.bin
bac7550c1db696afa15eb01f42d87cf46c2e36f869f2ad93ef4a14c0e80624e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 18192 bytes

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