Malicious PDF — malware analysis report

Static analysis result for SHA-256 debd9d3425a09c32…

MALICIOUS

PDF

72.4 KB Created: 2021-01-20 10:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 88f2c329eaf82b5f58158883f09845b4 SHA-1: 09679f8033fbafa1ae6fb2109a308eb37e766e5a SHA-256: debd9d3425a09c32baf29750accd9c5395505944d6d8fd6e5a2cd9e6b407363c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one that appears to be a lure for a karaoke machine sale. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links were generated, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wb?keyword=singing%20karaoke%20machine%20microphone%20for%20sale PDF link annotation
    • https://cdn.sqhk.co/kedilexele/i8EEheO/target_marble_run_instructions.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/bujodolusozabu.pdfIn PDF document text
    • https://site-1176842.mozfiles.com/files/1176842/bowl__com_standing_sheets.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/9993503.pdfIn PDF document text
    • https://site-1171867.mozfiles.com/files/1171867/asana_pranayama_mudra_bandha_by_swami_satyananda_saraswati.pdfIn PDF document text
    • https://site-1175497.mozfiles.com/files/1175497/ant_man_2_movie_filmyzilla.pdfIn PDF document text
    • https://site-1258452.mozfiles.com/files/1258452/dismissal_letter_template_school.pdfIn PDF document text
    • https://site-1180537.mozfiles.com/files/1180537/50481362750.pdfIn PDF document text
    • https://site-1174930.mozfiles.com/files/1174930/lowituwulun.pdfIn PDF document text
    • https://site-1166647.mozfiles.com/files/1166647/1474022338.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/wozowuledij/bazoretifepupujoj.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/a._p._p_full_form_in_law.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/gakitedatume.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/toy_blast_games_free.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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 5596 bytes
SHA-256: 5d25b7a4ab76cb2a8c6ec85b1ff5460424769d69a7cc6215a0a3748ae78906e3
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10184 bytes
SHA-256: f18b576f47e2c1d938542680effabd9e223d39648cc7ec28ee33f69d841dda67

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