Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb47241cb2481c31…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 04:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4fe69f5e88861f6b4ebe38c21a2191b9 SHA-1: 8a23786d0c12a8f38224b00bbcec57ae234cc9a4 SHA-256: cb47241cb2481c319d9c88524ab86de807809edab34a3b66dff9c8951bbff5b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=off+the+road+unlimited+money+apk PDF link annotation
    • http://cc-loges.com/uploads/file/60624557916.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/neforuliz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/44738087290.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/sowurogesefonutinexugetuj.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/7514452428.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/zuvinener.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/57885287658.pdfIn PDF document text
    • https://ebooksweb.net/files/file/lazagafexowisagesutevojo.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/vijiwu.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/76971350885.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/pukovegufakaxajekuvor.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/86283159901.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ace3026a3071878aaa94a83d530978cd/79755917876.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/27573589257.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/8723036308.pdfIn PDF document text
    • https://dm288.com/slicice/file/97161051643.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/jesilosiv.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/12150715704.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/bukagimufuxogobukemaza.pdfIn PDF document text
    • http://elskenecologie.nl/files/871857375.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/28825360906.pdfIn PDF document text
    • http://dhf-china.com/d/files/livemezivamijinapo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b61c38993---16702695268.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_off0000b076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 16820 bytes
SHA-256: b1de57b053abfd77925d4bb6bd7e2c14b796f69faa1d4b4c7f59763893e64a2e
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10924 bytes
SHA-256: 7069b55bcc59cdf89dc2fc9dcedbc6f782964047eb9960acf083823a7984e01b

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