Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7f653088ba7398…

MALICIOUS

PDF

72.1 KB Created: 2021-03-17 05:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c34e9b7aaaa4c6b5c794c5b82e569ba1 SHA-1: e8d08cd14f989cde1d9ee3e9388a4ab13cd1590c SHA-256: 6d7f653088ba739843fc9a73f5e76b9775e2195cab86d132312c65f6d78bd6f2
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://leonvi.ru/123?utm_term=woodturning+bead+forming+tools PDF link annotation
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/4263584.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/e11fcd07e229e.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/25215051659.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/24b07e.pdfIn PDF document text
    • http://sarhello.online/nabukdoflk.pdfIn PDF document text
    • http://gaxesujite.medianewsonline.com/fomivubekawivedenapesetev.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/nesiwudajowed.pdfIn PDF document text
    • http://alex-travel.moscow/voice_assistant_for_android_tvdkqu4.pdfIn PDF document text
    • https://suxutusebosogu.weebly.com/uploads/1/3/1/3/131379987/novome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fcc549bb2f08.pdfIn PDF document text
    • https://negijozizur.weebly.com/uploads/1/3/0/7/130775009/1766839.pdfIn PDF document text
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/1425271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5ff7ff91c83e9.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/8363fac.pdfIn PDF document text
    • http://leyloften.online/rasusofedamojebeliz65rft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lerezazo/21178176213.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/bowezojo.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/is_code_1893_for_earthquake.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/gepegefategepofepinal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 5264 bytes
SHA-256: 4905b837d7687f9301cce3b1820fc65184e320ad1d202707c9da32e09bf6e23d
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 10832 bytes
SHA-256: 0abd863ec64eb9bb929b2ba954ac8d2e4d22e3e40c39c802aef66311f6d814c7
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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