Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1f099ef863a8eb…

MALICIOUS

PDF

62.1 KB Created: 2020-12-31 18:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3926165c41ee6662a4cb6172ed5ef82d SHA-1: 944f4d1d0988650444b168dbcd0fdf099e4338e0 SHA-256: 8b1f099ef863a8eb2a6166868dbc0f4bc2527ec36f1345f5af5a67e1d0bc9c79
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent URL pointing to 'trafffi.ru', suggesting a link farm or traffic redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to song chords, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=bad+religion+frank+ocean+chords+piano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5fa83f27161e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fabc0615aaff.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gcOhhwG/savifokowokukitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5fe562d445997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_5f9d30cc179b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f9ac2548b493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5feb94b23902c.pdfIn PDF document text
    • https://rimejosokodux.weebly.com/uploads/1/3/4/6/134691074/6a283ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f8916a36e9f2.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/nisiwanolom/fexedubaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0593e8b-5a80-424d-9463-9234f3715b57/ead_expedite_request_sample_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/bocas_del_tiempo_eduardo_galeano_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001c2aa4-ffb6-469a-9050-00834d59194b/balavan.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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 5528 bytes
SHA-256: 8128c3bd6b2fe068cbb19c35d8fbc167a21e0c6633a39ee3653e23e2a3a50295
font_01_sfnt_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 10784 bytes
SHA-256: a56c9462a4fa6718be0f10678a054859674d6b7ebdbc8727687253d876f2ba85

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