Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f359f4a1adf31be…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 13:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d66a33c21ea048327416d2f6edd6d2d8 SHA-1: 729cd3b3504879b3cbe9ae7cd0e419cf6a09b59b SHA-256: 6f359f4a1adf31bef93c4fb422c9ee60d06fab4a6339b644482699a4717d8f1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or potentially untrusted domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138474077374---74475391635.pdf
    • https://lochoanggia.com/upload/files/45220732023.pdf
    • https://paradigma.bg/uf/file/13221517863.pdf
    • http://grandviewgroupresort.com/upload/files/deramagevitamegugazan.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/rupoxelizutipakowedise.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/teliv.pdf
    • http://gramercy-grand.ru/files/file/36938024828.pdf
    • http://zehanbiopharma.com/upload/files/vonusizutatafiwumozo.pdf
    • http://chiaranannini.com/userfiles/files/86904881079.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/72666553662.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69b7a53e7---lufinetojatawozodazogabe.pdf
    • http://konstruktor33.ru/app/webroot/files/files/lasazavuboromolojajata.pdf
    • http://lawfirm.vn/MINH/user_files/file/kemigunaxevopumidu.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/96534981295.pdf
    • http://dokumsuzgec.com/userfiles/files/riwabewivimovokut.pdf
    • https://taksis.lv/taksis/userfiles/file/sujige.pdf
    • http://thaoduoconline.com/userfiles/image/file/pipenizaribusomujis.pdf
    • https://efckrakow.pl/userfiles/file/kobezapadaneg.pdf
    • http://studiostocchi.eu/userfiles/files/nuvupujikixafisimavet.pdf
    • http://okgwa.net/50/files1/file/11939144325.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/filasode.pdf
    • http://htwy.com/upload/file/zepopuverapuvibuverifi.pdf
    • https://luckysurface.itweald.com/uploads/files/6137133ae687a.pdf
    • http://stilistspb.online/public/files/uploads/files/37605472077.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=limbo+full+game+download+apk
    • 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_off0000ccbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 16792 bytes
font_01_sfnt_off0000e4d4.bin
484975f42cb7d8753829e68caed721e94705c2c45784e3bffc36532b524ac886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 10852 bytes
font_02_sfnt_off0000fd6f.bin
56c23c2cdda75522c5c14ad71ebcc646462e93119d797f0083c73b4008c02403		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 17720 bytes

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