Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c6e2bedc1fae52…

MALICIOUS

PDF

93.7 KB Created: 2021-06-03 23:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7e4a452044dbc516ad050695a05af989 SHA-1: b0949145fbbf77fa85c9deeb5e914d65a342e7a7 SHA-256: 93c6e2bedc1fae5273cebb270f5c887e4adc035a20f21bc96d0d5cb5e7d43beb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/123?utm_term=free++automotive+engineering+books PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65c6e304c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_602017a62222e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483071/normal_5ffbf47739d8a.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/zukerexujipod-pixolodera-mebekujasu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5fc7761fd9dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_606a0ba525058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_606399cc14367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469824/normal_5ff7e20b87b3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5fed51d0bf975.pdfIn PDF document text
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/dekirixuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5fd06a4d0bce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_602238b4c6a8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_6000a5c3a6e03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5fec5a6a86902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5fc9089692766.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc88b1dcba00.pdfIn PDF document text
    • https://kumaneke.weebly.com/uploads/1/3/4/6/134682587/dajuzegozobani-tonamoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojifot.pbworks.com/f/tijopawanup.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/15536125926.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144542556/pobofozozajefomovapotifij.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 5192 bytes
SHA-256: a328b997f1dc5d5a1d5ee4cfb2ea15670603f5ccf73713f30d07fd9e681b3adc
font_01_sfnt_off00014229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14229 11708 bytes
SHA-256: 6b87bff56e87f9ea5d1f40afb2456f86e739939d4d15a3b3cfa48dad1be4497a

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