Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd8b0f011b53eee…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 18:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f4d81438816c0c7e55460b4b1dc8332 SHA-1: a98586feb51b3d2646c90ce35bcd905190161d06 SHA-256: 3fd8b0f011b53eeec5c4ed0819e452d88745c0d5966a510d0c2dd48642c923e4
126 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate it's likely used as a lure to drive-by downloads or phishing sites.

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://ost-fogging.com/upload/files/zuguzafixikikejutixijiwap.pdf In PDF document text
    • http://pitchdecor-construction.com/user_img/files/xotogeraxivifasipofufej.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/87068327624.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xogasizikazix.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/lugunuzuzaled.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/19604313718.pdfIn PDF document text
    • http://ed-union05.ru/files/file/pomenadejawatuli.pdfIn PDF document text
    • https://beautydent.hu/editor_up/18821537881.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ce9dp27ngjvdifkkorbb0md86l/rofonodakodoj.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/dagixosuvagifuzipugozulut.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630578609.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/voxiferivu.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/fakafaj.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/47060939677.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/83778267464.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/18080069274.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/62889792609.pdfIn PDF document text
    • http://wsm.hk/images/files/gojonenagubexovajirefu.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/bowikixomalovokezasej.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/jimakef.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/pilonokolupuzijukomuxumu.pdfIn PDF document text
    • https://trieurodata.ro/images/file/46606089159.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138821148eb3---37745137397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dil+to+pagal+hai+online+streamingPDF 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_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD914 20036 bytes
SHA-256: 96119b56396637db71b7fd55394d3a744eb14fd3f96b678f982c7c0c62be6fc5
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10700 bytes
SHA-256: 3d57c83784d646dfd8f001068aadf2a3d701a21d574b47efe3c03051d6c2210a

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