Malicious PDF — malware analysis report

Static analysis result for SHA-256 c313b7060f4c68d2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 09:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2f6e37ad2da4a8659df7425b5d264f7 SHA-1: e77383cfb97bcd11fbc1da7eccda6f42692fdece SHA-256: c313b7060f4c68d29525d9fef3e63bd8a4351d262b6a1ef73bb65275d7ca6f95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs that redirect to external sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL redirection are indicative of malicious intent, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=statistics+for+six+sigma+made+easy+pdf PDF link annotation
    • http://ewtch.com/upload/files/zidusujufoz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348ece7e4d5---91419756721.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/29499797929.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/39674865432.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210910071020.pdfIn PDF document text
    • https://majubesar.net/contents/files/95249717527.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/22560831822.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/35523066833.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/jezujuwogaxoxekap.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/7046824225.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/leserawupogiledufenawo.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/32967321525.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210904_958837A4C5B8EBAA.pdfIn PDF document text
    • http://surtek.biz/image/files/20150323_151722.pdfIn PDF document text
    • https://rotitelor.com/contents/files/71696296462.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/sogopuvukizojokovo.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/57232337927.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/19992598616.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/nazivusupoki.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/resodozifimunevuvisuve.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/36969459636.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/84905843606.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/61088495291.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_off0000c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26B 11104 bytes
SHA-256: 677912b7a51dc64781a1e177ab4a0dbf58b6b39460ece954636e96f0ba232fa7
font_01_sfnt_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16500 bytes
SHA-256: 4a679d48df485faaf7c5e707c9812e93e7be33ddab2032f01d3b5db32e3d8e32

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