Malicious PDF — malware analysis report

Static analysis result for SHA-256 af860e8f432df6d0…

MALICIOUS

PDF

73.3 KB Created: 2020-11-11 06:31:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a5ab38df8b7da453241780088f13e490 SHA-1: 28986a758d376f82f7c78fe6b0be42b7afb11ef9 SHA-256: af860e8f432df6d0fab19a3374aff98ef02eb2ab291cafa809ea9e694078e342
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 0.9997

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://trafffe.ru/123?keyword=step+by+step+medical+coding+workbook+answers PDF link annotation
    • https://riseriku.weebly.com/uploads/1/3/4/5/134585500/41fdb58bb.pdfIn PDF document text
    • https://bimonodinedijov.weebly.com/uploads/1/3/4/6/134697137/makeno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fa3ac30c78cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f98a1ef1857d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fa98a54d382c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5f9e7b64dc6b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f8a69a160559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5faa03c1a0368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8d2bccdc527.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/kokesatodixon/lake_okeechobee_water_level_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0585c1-d176-4c2c-96a0-a3bafdc6a1bb/download_tunein_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0de885-afe1-407b-b39c-49bc6c7c155e/57789341736.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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 5680 bytes
SHA-256: 565e8d2dd11c0c99eba5101d0d4fdbae029ad837ac5cb42ce4b1746327582ca4
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 9720 bytes
SHA-256: a1b0c7276350bf7a9522954731e0dab8a0df1de59d0640e50b55a0e5a1532718
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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