Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3458343eb70e63…

MALICIOUS

PDF

86.8 KB Created: 2021-09-22 22:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73ef77d28effd1146376f5e011f04cdb SHA-1: 049003b4f5c61266ac5beee59ea8d34166dc02a7 SHA-256: 6c3458343eb70e63a0d88206c6e212708ecc636ede77bdf757da466ad0c0f6d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.galiantsolutions.com/emailimages/file/vuzafizo.pdf In PDF document text
    • http://hmconcretemixingplant.ru/d/files/50910652791.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/ronesadamasudewasuzebuxaz.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/48114432110.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f098c1078f---gobosalabenako.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/74234115882.pdfIn PDF document text
    • http://abworder.com/uploads/files/ruduzul.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131035a975d5---munovelivesiwixojadigapor.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/sumonafunagodepigijusep.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/42109209072.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/fowonadukusiledex.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-5/20210905102706742664.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/falogusunoziboxipiximub.pdfIn PDF document text
    • https://atrax.hr/files/duzerozeralot.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nuxiremotolasalogibiroro.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/wosokilujokipaf.pdfIn PDF document text
    • http://hmed.vn/upload/files/kosededubezakofemizeb.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/pefetilutupigafisisime.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/86775655886.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/54064626810.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/19735907915.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902213102_si3uz9.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=stbemu+pro+freePDF 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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10264 bytes
SHA-256: 8d19a6521d3a8508497f0530bf200af7986acfb783d7723677bbd0324e19e268
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 19024 bytes
SHA-256: 22b359ff051c29736d01096128f215357570d93ba8d5d8a99edc61c5c215742d

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