Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dd4ced81672f29…

MALICIOUS

PDF

75.4 KB Created: 2020-11-11 19:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 19c13c38248f181d8579f04f0ee2ab4a SHA-1: adadc666416f34e6ef642478f560f5c8e8181d98 SHA-256: 43dd4ced81672f2965e597a96a1d182e5b28488971b2756956098cd7d5d463f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm and a deceptive download button, suggesting a phishing or social engineering attack. The presence of an external URI pointing to 'traffset.ru' further supports the malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/123?utm_term=the+black+rites+of+lucifer+pdf PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f9253fed2194.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/wegugus/35370033843.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/papa_jogos_br.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/apk_obb_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/seginideposibigiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/reluragetegusexe.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/seismic_wave_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/49613616623.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/aryna_sabalenka_bikini.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/compound_words_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/29021952358.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/5599266080.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/salona.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_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 5396 bytes
SHA-256: 597b4d9af0b584542d14320f5285e630c4533e85bfe11f8fb7a7f0e6ddd3d1c5
font_01_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 11248 bytes
SHA-256: f37b6c5f01c5d04581a4b696939cc7c065e5c022e35fd0d819fb1cec1e0b808d

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