Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b42924dda25910…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 17:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e4cc8cb4aba301ba1e5a8d04e462351 SHA-1: 7f9d5aa4681ab2cbb84e0edb6cc692d019cc566f SHA-256: e5b42924dda2591076b0d82d8d58e76c1b4dd0c532158a464ca1c335fe2fda70
134 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many pointing to disposable hosting, and includes a visual download button lure. The document body is heavily obfuscated and unreadable, suggesting it is designed to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1581ad322ef2d26f7dc499333ac7a0af/37229154080.pdf In PDF document text
    • http://clubselectionvoyages.net/images/file/xupesunatibotene.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/3625615663.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/bozevezexexavumugigola.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/pinatikoguwilenudagurife.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/31380502952.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/6522766257.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/fudob.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/jisepiguri.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/gomimibesesuvalulikeduke.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210923_B00B03D52AC966CA.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219231852211693.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/18600872428.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c221bcc5b---40765411468.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/941289145.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/71388048477.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/manivabuwelobexun.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47945451127.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/19803293284.pdfIn PDF document text
    • http://runhouchem.com/upload/files/19667573456.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/30280420856.pdfIn PDF document text
    • https://labelmarket.eu/data/file/sulak.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/vurobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tom+of+finland+the+complete+kake+comics+pdf+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_off0000b125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 14652 bytes
SHA-256: b31c6b10c195446fe4b88290e77fd59cd1aea9818932ba18fb351f52970fafe1
font_01_sfnt_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 10940 bytes
SHA-256: cbc4b6e84dad9cf3766575f433779281094f71763a326c9a6ef734c171bfa3af

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