Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44e4f521af3863b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 04:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e8302abc42e0d374e4def8ce4499f90 SHA-1: 9f7b3bb5e01a214552c437a3cd7e56118953141e SHA-256: d44e4f521af3863b7af08dadb6e64687db8154a11bc7533d361e186cf290fa9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=usb+driver+for+samsung+mobile PDF link annotation
    • http://ubestsports.com/imager/files/20210919070025.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/70905594089.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/pomaxanawe.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210917043058.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/divugikoxasusafomixaruvep.pdfIn PDF document text
    • https://anakmeong.com/contents/files/netunujosidasaderewi.pdfIn PDF document text
    • http://koutingchina.com/upload/files/90654627844.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/rusakifanekifa.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/povefejedafis.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/totij.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/betabare.pdfIn PDF document text
    • http://samtekelektrik.com/files/63396337434.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/nojujudesadamikobedowe.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/92903851520.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/fezewowigogogilobiliviso.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/091444436687.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/15760889560.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/43591833857.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/82998216388.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144680474301---94311839334.pdfIn PDF document text
    • https://khanikango.in/file/92050237644.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/107b68709b178e9992fc263eb6ecc0eb/rovosegikafozuvofejof.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/bologa.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22117921897.pdfIn PDF document text
    • 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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 10912 bytes
SHA-256: 3d25d3766d2bb3056d0789a88ca5204dc39ea053ee6d07f7ee42c59c6689c3a1
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17736 bytes
SHA-256: d80d264bbb1fe9399c664f040e1978ad4309b6c2f895d47688e30aff7e1d6607

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