Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f5a4c0b21bdd58…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 04:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a70ef16d16e809e4fccb945536f7bd1 SHA-1: c4dd522ecb5e18d04fb1b42a9e93cbae94682d6d SHA-256: 58f5a4c0b21bdd5873d26e9df8b22d295d211805fd010643edebfdde6bfda77d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://flygarfield.net/userfiles/file/nebowigasonidutijabaz.pdf
    • http://agro-norwa.pl/userfiles/file/80831531653.pdf
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/nalewubilak.pdf
    • http://abwalabamaave.com/uploads/files/45839162404.pdf
    • http://pm-ural.com/uploads/files/36311440300.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1b3fe72038751a373b1fb2ebca72cd26/manafulobuxukotomo.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/pamixevijinuvar.pdf
    • https://cuatudongnhatrang.com/uploads/files/67107096945.pdf
    • http://innova-perila.ru/upload/files/gomibasojunuwikowenebor.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/wabewafutidip.pdf
    • http://jujucuisine.com/userfiles/file/90523144576.pdf
    • http://charolais-hessen.de/write/userfiles/file/pusezikinejuganajit.pdf
    • http://wsystem.sk/userfiles/files/jojamimazorezi.pdf
    • http://el-master.ru/userfiles/file/67805652501.pdf
    • http://85560891.com/upfolder/e/files/20210902124705.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137eec130d8e---vizikezazu.pdf
    • http://polymer-optix.de/userfiles/file/tonovelamifazuzofasiw.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/vezipamalobozo.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/53320261687.pdf
    • https://mabuksusu.com/contents/files/batidan.pdf
    • http://sintjorisparochie.nl/userfiles/file/lugevisuruwerab.pdf
    • http://taociren.com/upload/file/210907103425759501vfgvfi98aigv.pdf
    • http://dailymaydemtien.com/userfiles/files/turapudin.pdf
    • https://artistprasanna.com/userfiles/file/wazegeguxuxasubukopo.pdf
    • http://zaun-produzent.de/userfiles/file/14564988255.pdf
    • http://vantaidongsaigon.com/uploads/files/54935018341.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+free+scanning+app+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a3.bin
77ce0aea5aab52cdf195edc7f601c5c1f205c3ac44c2c4ae545a7bb2b6bcca85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 17392 bytes
font_01_sfnt_off00011d76.bin
4efbe181d74f50fa2cb4e20d8ac21715872d04e76ce2dab35a83ddac915964f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 10804 bytes
font_02_sfnt_off00013656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes

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