Malicious PDF — malware analysis report

Static analysis result for SHA-256 58239c5cbfc3e269…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 07:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a377f40915919058ff4ffce20fb3f9b7 SHA-1: c5a1b3ae2c76b7f5446633a2c265bbfa04142180 SHA-256: 58239c5cbfc3e2696f4dc991fa105e5e7b777d538fa39cb57193cbd3c6fa13ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to suspicious domains, and one specific URL is identified as a link farm. While no scripts were directly extracted, the presence of external URIs and the link farm characteristic suggest the document's purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://euro520.net/userfiles/file/1632095789963603112.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/52669051355.pdf
    • http://alatasfilms.gr/ILC/img/file/xedaxelujasopedupapowatoj.pdf
    • http://shopabrang.com/images/files/11481173786.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gekus.pdf
    • http://hanasushimenifee.com/uploads/files/nojoxuzamujagejat.pdf
    • https://somogyplusz.hu/files/senebut.pdf
    • http://medtravel.lv/images/hand_uploaded/files/19444697224.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/fumid.pdf
    • http://stefani.cz/fck/file/fagomuv.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210920_572068DA3D51289F.pdf
    • http://pb-book.com/user_file/file/55986106329.pdf
    • http://4darchitecture.org/img/all/24199970856.pdf
    • https://legyenegyjonapod.hu/userfiles/files/rirativudawutegixeferovo.pdf
    • http://yejida.com/userfiles/file/19131910058.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/kinalubibofowopagizi.pdf
    • http://cnkls.com/userfiles/file/1631905850.pdf
    • http://bayernglobal.de/userVZ/file/misazalob.pdf
    • http://sanmorales.es/userfiles/files/wifaxavuxu.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/99515408920.pdf
    • https://slezanie.eu/userfiles/file/juwotivimoturidevokipadid.pdf
    • http://grandviewgroupresort.com/upload/files/tugowifedimudujap.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/10195985266.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/36721692044.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=why+is+my+phone+slowing+down
    • 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_off0000e1ac.bin
92c112514c6a6020e86e91c7ba3921e3220eecb42efc09a3800278af6e7ad380		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 17488 bytes
font_01_sfnt_off00010eec.bin
316aa7deb0cf5d93bc794d3a300461008b2ee5b74f998904411bfe702d01c1a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 10672 bytes
font_02_sfnt_off000126f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes

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