Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35b837d3c1df425…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 00:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1723964dcf3fce56152f91f68e44b276 SHA-1: 3220bf0dbdae9a7336059b1f6c41fba15a98171f SHA-256: e35b837d3c1df4251494d03c1607dded7f8dd35cc6232a4ab3b130e25d90154b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of distributing malicious content. The PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://retailcop.ca/files/79365885377.pdf In PDF document text
    • http://sonsuadogo.org/Images_upload/files/56983544794.pdfIn PDF document text
    • http://htwy.com/upload/file/kagotexenabi.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/zisegokazedezuwirefis.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/lurav.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/talos.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/vuritakobugedasav.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/35070083278.pdfIn PDF document text
    • http://rs-entp.com/upload/file/wajegepofi.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161303381e81a6---fedikojimebobopad.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/juvamuk.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/mefivepusimixegim.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kominuzarufij.pdfIn PDF document text
    • http://foxadv.net/file/65181810214.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/97202216204.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/82123931077.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/15828664651.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/wasakaku.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/mowepukudem.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/muluwinexugeposap.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f256504c---80839050039.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pavitujenizufafugazesopax.pdfIn PDF document text
    • http://poultech.net/d/files/63677797765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=app+is+crashing+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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 10500 bytes
SHA-256: b5b3599677da5ee521b06f3467562b1aaf7cb7cc7997201543ebf9f7dfbc2b6d
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 17988 bytes
SHA-256: 21bad52296dd026d14e834402f2e6e7e3efa64df77924b7b21ae162d2ed2b63f

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