Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c333fa225fff19e…

MALICIOUS

PDF

77.6 KB Created: 2021-02-14 09:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f79a2d662bcd3cc60c4c4749714dea6b SHA-1: 6258b6a2346cdcf0fee3962c0b56d7b2dd565e32 SHA-256: 6c333fa225fff19e11d45658df99d46511cfa7b168f05797f88f0101f4afbee3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=love+test+calculator+game PDF link annotation
    • https://cdn.sqhk.co/loxowopiv/5Zllgh5/search_and_explore_tubi.pdfIn PDF document text
    • http://hookup753.fun/planning_engineer_interview_questionslu27x.pdfIn PDF document text
    • http://bulewedulipofam.iblogger.org/bar_graph_examples_with_questions_and_answers.pdfIn PDF document text
    • http://xukuvapama.iblogger.org/66184282657.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/ggig9hd/dash_dungeon_tomb_runner_dungeon_quest.pdfIn PDF document text
    • http://eurostore.info/mivonukudim0e4mg.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/fgjbhiQ/63899712801.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fozubogedunok.rf.gd/66210279320.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/defect_density_report_in_jira.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/25593388290.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/72964577151.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/xovebitex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 4848 bytes
SHA-256: 5ec8a818d7dfccd544ac08419800332f68f865806a5502bd1c8a070d492afe09
font_01_sfnt_off0000ec35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 2044 bytes
SHA-256: 28336a0cb3f8e641e75945af3d35324194abd932e21d2bc38800f63db353b10a
font_02_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10984 bytes
SHA-256: f6c846b582c6a0b43bdd755ad97bd837876dddef10fb7a9c134e25fe952b5512
font_03_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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