Malicious PDF — malware analysis report

Static analysis result for SHA-256 917faab6dbc0157a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-12 21:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6908938de4e5d01c75ca247bcdc7502 SHA-1: 5b75141e9a2d12d2fb3f49d691183a1e8cd2131a SHA-256: 917faab6dbc0157ac8a52706ff1f2c840e2eb2f6f038d78335be2b2a3d05f36e
164 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=reduce+pdf+size+acrobat+online PDF link annotation
    • http://metalllift.ru/guxedadamewadpiyc6.pdfIn PDF document text
    • http://libotopatolar.iblogger.org/wukejukakegirituweg.pdfIn PDF document text
    • http://uuuuull.space/entropia_universe_melee_guideghohc.pdfIn PDF document text
    • http://boguredu.iblogger.org/fuzzy_grouping_transformation_in_ssis_with_example.pdfIn PDF document text
    • http://jeruxawi.iblogger.org/xitoduler.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_9cbc78cd0f834972801f03fc8cb5ca35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xarojapi/chromosomes_genes_and_dna_worksheet_answers.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_6f4448a740fa4aa88f2b2b369556c560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/3209837806.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/docker_arch_linux_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/tuzuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/74049190276.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/74568236108.pdfIn PDF document text
    • http://sekizipax.rf.gd/lozaxodatewikafesubed.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/after_effects_free_templates_intro.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/amu_form_last_date_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/2_piece_puzzle_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/formic_aldehyde.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/96112546215.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/pabapexese.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/91394131190.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_bb6d28fb0c04423ea4a85123fc30ca87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/hongos_ascomycetes.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_4c675300beb94efb9384c82d54ae67a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/vujesagaxunomawug.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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5348 bytes
SHA-256: 07bc18cfa7b66105fbe26c450dd75f8b1a5cbc740205b93d0109bce2e3353b48
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 10252 bytes
SHA-256: ee6e204b3b192c3acd878d8e19cc9838285c62f92b2b2e6b326bbc67c687f101

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