Malicious PDF — malware analysis report

Static analysis result for SHA-256 251800f3ccf3caa1…

MALICIOUS

PDF

63.6 KB Created: 2020-11-20 09:22:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 17b287fb8302f38f7098739602a17de8 SHA-1: d933fe07e9ad0f80697f1ff48326222d4176f494 SHA-256: 251800f3ccf3caa100d209df988257fd1e84ea8b1f4d0e65dcc34fe06dde68a3
156 Risk Score

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 0.9996

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?utm_term=slappy+and+the+stinkers+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fa62bdc2129a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_5fb565e4061a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_5faeca278763d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f8b29ca1b330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f86fcc2c4d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f9b2067b685c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5fa30945512c3.pdfIn PDF document text
    • https://zunifoxorim.weebly.com/uploads/1/3/4/3/134320692/5c1eaed5f33e840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8e632b813bc.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/zakunafu/westside_pool_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/flutter_bottom_sheet_expand.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_off0000bbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF4 5316 bytes
SHA-256: b7e110e61109944eeafd36e9211aae3a9535688cd9f556b0d16415fd6abeb231
font_01_sfnt_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 10564 bytes
SHA-256: 3bc99284b43fe2c0ba2a38044bbe66831d79d7e648b0f183608df8f8bc916aa2