Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6768f1a4e9726cf…

MALICIOUS

PDF

66.5 KB Created: 2020-11-14 00:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7f230fba2e4272f6629c35aab3d3e40d SHA-1: d55d80883a7f0d16bf782f00846346cdad9cfeb5 SHA-256: b6768f1a4e9726cf488cdda4d8523aeba71b4b051cbc2ddfa92c2b7f6ab46b39
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 0.9998

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 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://trafffi.ru/123?utm_term=carrot+family+weeds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426699/normal_5f9a93b71a617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5f897e746f305.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/fuzidex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5fa4efecdf4f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5f98d606ae669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5f8a6a02dba9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5faee0fcefdea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_5fa6d339c0d00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_5f961aeadfe3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5fa6634c6ac84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5f8ed1849d6a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fad80b408b4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/the_last_kingdom_season_3_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/jupuwidazapuzu.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_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 5152 bytes
SHA-256: 6e6dff4eebb6eb89e4f9f6005e5665c8406eb3046d428a749d3d67c89b7f0055
font_01_sfnt_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10432 bytes
SHA-256: 3791c099659c6790c006e697697099195363fe0ef272ad201fa1eece877c8f47

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