Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb9f2e8ac60017b…

MALICIOUS

PDF

65.0 KB Created: 2020-12-18 08:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fea1b03b64d67c051817dd09561a2120 SHA-1: d9704f36f4fa98576721b23e37f538147d22a630 SHA-256: 3cb9f2e8ac60017b888954c1f50f9e82829e394e91e56e305da7b3423727b19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection scheme. The embedded URLs and the PDF structure indicate an attempt to direct users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=naacp+harrisonburg+rockingham+branch
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/474122.pdf
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/zawudeganoralopada.pdf
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/7dfbb3663.pdf
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/e8245164cf1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af5d74a9-e0eb-4131-b99d-f7b7c60db607/sibetizafuferaxetupuzov.pdf
    • https://s3.amazonaws.com/povelenavuviw/morowesizivomoviseg.pdf
    • https://s3.amazonaws.com/potamotaz/88744389857.pdf
    • https://uploads.strikinglycdn.com/files/386278ff-6d8a-4b9e-8392-05be24d1e949/datanavusadixixiter.pdf
    • https://uploads.strikinglycdn.com/files/acf800b7-7043-4271-bd55-43993d4f9ee0/kufajinemanojulavidaxum.pdf
    • https://uploads.strikinglycdn.com/files/0d3c0018-69f2-488a-be30-b36499072ce1/6099291390.pdf
    • https://s3.amazonaws.com/banula/burger_bistro_hazelwood_menu.pdf
    • https://uploads.strikinglycdn.com/files/6effd29c-b3df-420e-8e88-68b372b26f1d/adult_browser_games_kongregate.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1fb.bin
d9b3786dabd4c7fd1f02b5ce3b32f7cc921f4af2ee7eed589b540fb6abc584c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 5488 bytes
font_01_sfnt_off0000d487.bin
f72d3ddc0acd337671ca6b346afc798c5189b35798dadd9385fa3f76573ebb38
pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 10192 bytes