Malicious PDF — malware analysis report

Static analysis result for SHA-256 4135a41d4f290980…

MALICIOUS

PDF

74.2 KB Created: 2021-02-20 12:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: da693d9a0dd009a27b9c9ec7306fc34d SHA-1: 223b076e2ba9048c2a9845871f835e4d55d94e6b SHA-256: 4135a41d4f29098019facc7bc1c9da8d24b771d9a4ab45d7e9dd634b2cdbd59c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicating a link farm or a distribution point for further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=bsa+conservation+handbook+pdf PDF link annotation
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/nabapefug.pdfIn PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/3424254.pdfIn PDF document text
    • https://gojamomajaso.weebly.com/uploads/1/3/4/6/134616238/63211bb9e1.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/juduk/vipikikusapiwobetagikames.pdfIn PDF document text
    • http://bujageb.rf.gd/video_recorder_apk_xda.pdfIn PDF document text
    • http://bofozavo.rf.gd/citizen_navihawk_blue_angels_worldtime_c300-q00842.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/11394261376.pdfIn PDF document text
    • http://rujekikixew.epizy.com/format_sd_card_linux_dd.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/cajeta_coronado_informacion_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/zosuvubewubi.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/vuwed.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/wexafapinisakodogu.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/chingam_1_wishes_images.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/u_s_air_force_ocp_uniform.pdfIn PDF document text
    • http://fobexegedun.epizy.com/14801865523.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 5524 bytes
SHA-256: 3eb6e6cfaeff3cc12268e5e93fe83bba0035b6aa753de56f37e531a87d7f3d81
font_01_sfnt_off0000f7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BC 10608 bytes
SHA-256: 1ece145f080157d9e7e848f925fdac694e37edacee4f4a13df822845d92a2340

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