Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c9a097f47dfe3…

MALICIOUS

PDF

93.9 KB Created: 2021-09-19 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36e8b16fabf63a1dacf6ca4e20242dae SHA-1: 9f102969ae95de8102590600ae52608d13d01bbf SHA-256: c17c9a097f47dfe339dff576a0e5868d97491bb239fe3f373f5bc4ac6c83f6c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files, some hosted on questionable domains. The presence of a 'download button' lure further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hotelbelleepoque.bg/userfiles/file/9175328526.pdf In PDF document text
    • http://dispensapertutti.com/userfiles/files/jamadutedofapedun.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/xadugebi.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/93091299649.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/90566754042.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210911000508_3c66oo.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/dovigamurazisakul.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/53110381943.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/17125097030.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090617552073499.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/sudabowodakazuwekogovibu.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/71819329096.pdfIn PDF document text
    • https://clubon.top/uploads/files/82176864636.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f3493c037d4b792a843e382c11ddaf9e/vozezepodaledajepositubun.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210918164832.pdfIn PDF document text
    • https://semut73.com/contents/files/45318377869.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/jurokuribipu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/mipowepivuguza.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/gegulavonuduka.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xopopebafebobizubixo.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/51130639284.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/jopirud.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/5335145046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zack+snyder+justice+league+123PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 19104 bytes
SHA-256: ebba968291412fd396976ffb730501527be4a210081522aaa2fbf2fe206c80fa
font_01_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F82 11168 bytes
SHA-256: ac1587901aa66889e3d7ec45a2408f0531132491223c673f30e821d024e1a3bd

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