Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd14b8b4db45c887…

MALICIOUS

PDF

72.6 KB Created: 2020-11-25 03:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 55899d8b6ca1b84f04130786ad05c164 SHA-1: b05a21aed637c6cc48f587f301c92091c67a4054 SHA-256: cd14b8b4db45c88771430a2bcdfa470d3862e6812dbb2d64681cae32b2550e42
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm designed to direct users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to search terms, aiming to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=the+words+movie+ending+yahoo+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502436/normal_5fb55e6908202.pdfIn PDF document text
    • https://wuxepufoz.weebly.com/uploads/1/3/4/3/134371519/4ff405ccf.pdfIn PDF document text
    • https://kibejopabut.weebly.com/uploads/1/3/4/8/134884539/libusovetezadogofopa.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/pewebopufupe/11414489486.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/54892987210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d64caf-9e69-4ba5-8116-83be1692d61a/crime_patrol_17_july_2015_full_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d9410e-cf65-490d-8216-1cde87a65b3f/season_8_week_10_battle_star.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2320a05d-705a-482b-8b83-4bbbe27268f6/gisufimufevaleninepadut.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/14947982385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5361beb-4a4a-4436-bd38-b756ed5d7530/xenazikozotuf.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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 5412 bytes
SHA-256: f05876cf1fa027e1cae7a37a3b15579456d2a162c151019096a5e3b24e621dfb
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 10968 bytes
SHA-256: 5a46eed588aeaa66f05915f1177ba37eddbe725745dc0a78dff1f789d8ca5163