Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a47caf4ec8dfbb…

MALICIOUS

PDF

65.9 KB Created: 2020-11-11 11:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3ae0d1472af0bac24e9a0f228a1d629b SHA-1: d0c10a9da07c999ad04c4f962d61e8d17059efb7 SHA-256: f9a47caf4ec8dfbb88a6689659a8df226537ca797ee265a4e165e1df48d4c625
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://trafficel.ru/123?keyword=edtpa+syntax+and+discourse+examples PDF link annotation
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/werolajaf.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/e717c.pdfIn PDF document text
    • https://povelelowu.weebly.com/uploads/1/3/4/3/134331265/6476884.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/f5ef1.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/tozituzifinami-kiroxokamowa.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/loxatadawisuvid.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/743b2f82-c5bb-4b91-b15c-3a83a2093d2c/vifotaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/28680181771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b2fea0-514d-4a2c-a372-c530a792055f/safuwavedakux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43fcd830-1195-4075-917a-88fa225b7c0f/tavuxiborakadozadokupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad27082-1e91-4cdd-8472-0f2002965b2b/73536334351.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_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 5348 bytes
SHA-256: 8d0f8fb59bd9cec639e6d7c9e1ebf278794b840a6624d54c5e9f9549c2337d0b
font_01_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 10344 bytes
SHA-256: 76786604cd026aea5abe0399ad81cc4830891371cb6b227b82ac1650d2f8acc9

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