Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c18d2ab8ad1735…

MALICIOUS

PDF

66.1 KB Created: 2020-11-11 13:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b449335e8fc2c1dd115e5c8ba2fa6e11 SHA-1: 15d623c6a5539016cc5e9f1dcc59a6c08050a265 SHA-256: c5c18d2ab8ad1735a0b2ffe4f59c3595f1468141c2ee168ffecdcd8c16b97d21
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://traffset.ru/strik?keyword=land+contract+homes+for+sale+in+lansing+mi PDF link annotation
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/zoguwux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_5f967d4f92686.pdfIn PDF document text
    • https://gugukufetufa.weebly.com/uploads/1/3/4/3/134337187/55559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_5f8eb9fdaca58.pdfIn PDF document text
    • https://jasixuruvixu.weebly.com/uploads/1/3/4/2/134234618/db70ef5af.pdfIn PDF document text
    • https://jokineviraxara.weebly.com/uploads/1/3/4/2/134265776/zulalidogixix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5fa83fc886caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f9e5892985a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f97ac3c4e5d7.pdfIn PDF document text
    • https://vovufopoxin.weebly.com/uploads/1/3/4/4/134466437/5687932.pdfIn PDF document text
    • https://bijoxopibomer.weebly.com/uploads/1/3/4/3/134325560/3139480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49de0ed-ac07-40c5-b728-81a02d936bd6/60190784938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb2b77b-b2de-453b-81bf-3f143985523b/2008_toyota_yaris_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deccf829-b367-4580-ba98-240b9a67a449/tadafikeribaxat.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_off0000c5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 5376 bytes
SHA-256: 46cd0b7a12e7fda2c887143af817b8a4f7d3bac48fc29efeddc1919f72e48978
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10424 bytes
SHA-256: 696669896e39bc4db4c92e7129ff800bc3f5532597ce159472b4d2899298bde8

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