Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7e56a6c4029c65…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9d12d3b2485bb19a16a1a7ed93a71f8 SHA-1: 0c2fd30e918eb98633e628fad16c41bbdb029cbf SHA-256: 1e7e56a6c4029c65496f242498fa7c4e45ff9eedb7cac6de970cabc1b551ce13
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The presence of a link farm heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://crysiq.ru/uplcv?utm_term=empire+warriors+td+premium+mod+apk
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0a98d14af6bae65b55980897524efd39/tupotefibopukowezasimala.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/44813349730.pdf
    • https://autosaloncenter.com/uploads/file/wokevoxiworulimemu.pdf
    • http://tw-sincere.com/upfiles/editor/files/zulerexujesametavunejet.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/vujelaxipanun.pdf
    • https://pernambucoimortal.com/imagens/files/47784480604.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/77501442979.pdf
    • http://hoinhikhoavn.com/img/files/ziroro.pdf
    • https://www.karelo.com/uploads/File/26166971715.pdf
    • http://viswinkelindex.nl/images/uploads/55468243179.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/renamomim.pdf
    • http://cascad-trans.ru/files/ledajisu.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/dudiludibidunimewejonudu.pdf
    • https://champion-osk.pl/userfiles/file/74436979494.pdf
    • http://jullien38.com/ressource/site-image/files/jajurirajijis.pdf
    • http://dexgerm.com/data/file/userfiles/files/24960046926.pdf
    • http://capitaloffice.pl/fotki/file/20016304086.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/65365399028.pdf
    • http://toyteepee.com/uploadfiles/file/210915120243558632pihhx9.pdf
    • https://lrsinc.co/userfiles/file/4186122303.pdf
    • https://stockbauer.hu/uploads/file/75886151441.pdf
    • http://highlevel.pl/userfiles/file/tobirolotoloxogojadiwig.pdf
    • http://szyoujin.com/UploadFile/file/20210909220441087.pdf
    • 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_off0000e780.bin
ba0310ca8312542514c828abba14a93608a4027a50a88a2fa9e667d16c3054d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 21236 bytes
font_01_sfnt_off00011f37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 16792 bytes
font_02_sfnt_off0001374e.bin
7afd0d1fb65a3451fb779b4678cb05ec2b8bd8f1113c7837a191149c116cf849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 10664 bytes

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