Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7615b2e84435597…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 02:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45446dc20e889621f6757512c0530247 SHA-1: 804b3f00de1c62b14d052432c60d33a784d25f7f SHA-256: f7615b2e8443559707bc4a1135c8c903ddaf335b210949132be7fe1eb4849b4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were directly extracted, the presence of many unknown URLs points to a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1e537bb7---73334662158.pdf In PDF document text
    • http://pol2-simf.ru/userfiles/file/liwunonutemumipadu.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/wusofisojasalaguvonu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161336e9e53172---29978529701.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/66434727713.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/bivaketedevi.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/38643359924.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/75272463847.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/74524351895.pdfIn PDF document text
    • http://salt17.com/userfiles/files/fadojetidirev.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/70146027147.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/tanefibanedixobo.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/jadavejipovedunodirag.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/nagakexarotaxajemi.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109131925379826.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/79701843972.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/bebebusizidinavakibiliw.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/fugeveloruvewinepizo.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/17518176649.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/67129038662.pdfIn PDF document text
    • http://com123.vn/uploads/file/97743211701.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/54868918992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=anatomical+and+functional+divisions+of+the+nervous+systemPDF 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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 16436 bytes
SHA-256: 24b998a7cedc805f4b67163d804acd7ebf3b52f8d7082f9da81658b02f212b10
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 11004 bytes
SHA-256: 767e7d1ab0a4f48b5a531b48f4e2804293eaf508fdc652d0b015d1431827b374

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