Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19178528dd8669a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 07:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2583ffa469c35f993170eb27be5a1c2b SHA-1: 37ce64e111097019b41948dad693dd8f52f7a941 SHA-256: d19178528dd8669aea5074490b0d6cda0c433e485a10dddfd23b971caed7667b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded, suggesting an attempt to redirect the user to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://naphogacomposite.com/upload/files/90124189456.pdf In PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/rageribubabefafesixu.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipokijutefugo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sataru.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161434da6daee8---dukizitusasunukulosusit.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210903_C78B099E11BB96FB.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/45296039886.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/kexes.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16314131344851.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb65406f79---dudojiru.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fasufizorobodiparupulu.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/zogaven.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/56038572701.pdfIn PDF document text
    • http://master-vin.ru/files/file/bixaxilanewewatobub.pdfIn PDF document text
    • http://school15-tyumen.ru/f/85335921999.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/fewasap.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/43080773947.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/37689436970.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/xuwisitekijegep.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/kepefa.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/sexevaputetewowefipoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=at+home+couponPDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 17396 bytes
SHA-256: 402dfccd3f1c8f66047e3a0bfcf76da972acace8fb90c6f259a5ac462a1a577a
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 10152 bytes
SHA-256: ef101095debbd9c33fed0711e228ac29179b41ad841956d4e547110e303a1d8e
font_02_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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