Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b18bf55ad29e663…

MALICIOUS

PDF

61.5 KB Created: 2020-11-16 23:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af648b5d67d8c51cfe667c81af7d7d32 SHA-1: 920470d0615ba34266e2ee584d347d5f13ddf429 SHA-256: 4b18bf55ad29e6630f39fdba3b5a0b65930a3922df4d6aea6d3719b51f11bc2b
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 0.9974

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/strik?utm_term=sonic+colors+wii+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5faa0328b1cfe.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/892955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f99406f1b550.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/woberiz/ipad_mini_md528ll_a_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/25760178054.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/buckland_school_uniform_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e147277d-010d-48ec-9e79-e4520d38d7e2/roxette_listen_to_your_heart_mp3_320kbps_download.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/reno_memorial_day_tournament_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/how_to_make_bioplastic_from_banana_peels.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_off0000a84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA84A 4368 bytes
SHA-256: b6d5b591bc97c42220e14f740c286506f5cb45988c159ee51d91bbb31f00aeb5
font_01_sfnt_off0000b70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70B 10756 bytes
SHA-256: 30fd8e544e6d886dc48d0b6fe9a8b5ecafecbbb167c6250061fd8b93b4a6347d
font_02_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3