Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc0a75342529ea6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-16 16:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a028f0874e8bf22f29347dfad4cfb531 SHA-1: 55bfa757c5341b30490a621660ec2c8be8a7ba28 SHA-256: 6cc0a75342529ea685465a3e9212781b1fc061b0a205253032cbbdf053d76fef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it could be delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://analogsys.com/uploaded/file/50051865961327b27ef444.pdf In PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/dugesobenofizixoxurigaz.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/xudaluselopuravewidu.pdfIn PDF document text
    • http://myredm.ru/uploads/file/kidogikidenanenofe.pdfIn PDF document text
    • http://furniture83.com/upload/files/78885915470.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/42490888246.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wejup.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/60651692336.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/ruboxofudodoru.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/kitulojutomerefexe.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/30970094897.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/41197605884.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xifonavi.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/62118724596.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/77668636892.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jmui7b5fn4s1li6ppfg6jbag02/giwusirumuju.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/vifureno.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/15185117086.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/738e93b2fa14bdde24014a89b3c969c8/kubanomu.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/pefekifepegazafejanixap.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/80413117783.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5673066933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=using+wifi+hotspot+on+androidPDF 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_off0000bf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF74 17520 bytes
SHA-256: db00c9205973526c971160b9da31732cb21f45bd2626d82a26bdc49f391517a2
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10692 bytes
SHA-256: ba3e9eea1d7fdda6ad67a866e2c1d90983c78d2cb99f9e0b40f6bc5d2e3a41b3
font_02_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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