Malicious PDF — malware analysis report

Static analysis result for SHA-256 f010f6a1831b83ff…

MALICIOUS

PDF

83.6 KB Created: 2021-03-23 05:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7585770a5a5b6bd2c48093109e180993 SHA-1: 83d76d07f2a9074551168489d0cdb1a5778fa4ca SHA-256: f010f6a1831b83ff27d2eeef24a38436570d79db6d984f9fc0e8a3defd7d2286
186 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 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 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.
  • 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://ponafet.ru/wix?keyword=representing+proportional+relationships+lesson+3-1+answer+key+reteach PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fe1b2fd6a71c.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/7799b.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/taremezavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_6011991688335.pdfIn PDF document text
    • https://ramujodavuratot.weebly.com/uploads/1/3/4/6/134667495/pomibibovis_lesuzumixas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_60593cdd77cc4.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/jodexefita.pdfIn PDF document text
    • http://wixiziz.iblogger.org/didemuluje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_600371623f9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5ff279eeb3ad4.pdfIn PDF document text
    • http://nipuxikupiluzep.iblogger.org/6337300440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pogolo/39769033134.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_3f67b0c3cc014e858d615dcf0bb2695f.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_3e0ea80123794e27954d75a64a7fd22f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dinilederu/wuxofafa.pdfIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_8e83f29f2a774958ade5383bfcae7020.pdf?index=trueIn PDF document text
    • http://vububogux.epizy.com/musewagebetim.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/57301689297.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_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 5708 bytes
SHA-256: 4e53a4f39eca380948390253e31877d3317b4636af23e9c828567d0169828b86
font_01_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 11744 bytes
SHA-256: 046caabac625106c7b4feb70f88390cbadc2c851116fb3cbc6862bdf7353e071

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