Malicious PDF — malware analysis report

Static analysis result for SHA-256 52341cdebc77125e…

MALICIOUS

PDF

85.0 KB Created: 2020-12-24 02:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fe8cf2e6418a50f925618a379e4dc3fe SHA-1: 9701287b07d276978b60e809b66ada97b8a20426 SHA-256: 52341cdebc77125e100f4df916d7421bf9d60b7c1db079ed253410a11fb1cfa9
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=anima+weapon+quest+steps In PDF document text
    • https://mejulima.weebly.com/uploads/1/3/4/0/134040536/77c2230f948f.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/tejokiju-saxadoko-mijejavomo-gemasosasowigi.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/85531433af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_5fd9acc9a7c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5fc36db9d79b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_5fa5c678db3d2.pdfIn PDF document text
    • https://cdn.sqhk.co/javejako/jaidJhe/34916247896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5fabacc316082.pdfIn PDF document text
    • https://sepijoverik.weebly.com/uploads/1/3/4/3/134317252/826689ec.pdfIn PDF document text
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/fobejokapogudivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5faa09e58f719.pdfIn PDF document text
    • https://cdn.sqhk.co/gumoxixo/R2CAbmM/javojikireradupi.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 4924 bytes
SHA-256: d1d0c8025fd596a5b422754be0e03dcf37e34f0eb3bacc154eabed5eefe8cf9e
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 12220 bytes
SHA-256: d736190c91774a7f1c4f553706d23c9532b6f509cf4cc7108d89b21d37421b69
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_03_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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