Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11076f61aa3de0f…

MALICIOUS

PDF

77.0 KB Created: 2021-10-09 03:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a45ce9b6fa4fd0e6150dfe994d76ab74 SHA-1: 119cbd257703c3cab18f740122fa6a4de7bcb24a SHA-256: f11076f61aa3de0feafb9099a53c1be54811d53b1279e3e547ddfde2613599b2
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 domains, suggesting it functions as a link farm to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jackinthegymtpe.com/uploads/files/202109100935156219.pdf In PDF document text
    • http://marinapogon.pl/upload/file/wexirebuwidiki.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/pumenadojadebatosinume.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/41602132471.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14077727891.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613992182bb09---tovujudasepuvifinurol.pdfIn PDF document text
    • http://redagowanieprac.net/Upload/file/78745548161.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/rojajibiranipomudasutudeg.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/47439444743.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/53526531953.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160ced433c8f---lifujivosapotitu.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/pozixusefunamizo.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/41234805780.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/47134022591.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/33892183348.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/89950586133.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/pofeto.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312815676616.pdfIn PDF document text
    • http://okun.su/upload/file/sikanosidiralojasanog.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/63197091199.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/sajavubelejagasalowupuxip.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/80045676365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=inflamed+salivary+duct+under+tonguePDF 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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 16840 bytes
SHA-256: 21e8784b5c7bfba28849f7c9193a3cb1ed641f9f811821d9948c50ac29919086
font_01_sfnt_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 11052 bytes
SHA-256: a0177e882c197bfe24f5212b556301231e59bea8386ce744f1186c95dfa5bc20
font_02_sfnt_off00010de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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