Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c3f2dd10da78ac…

MALICIOUS

PDF

74.7 KB Created: 2021-04-02 22:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: be58345079ffda4e38152566e6601acc SHA-1: dc4898ecc89bd97165bfece2cf5b259d828d957b SHA-256: 11c3f2dd10da78ac328980867aecedee8b70dac1713c111c31f8ffb9ec5dc11e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=white+christmas+cast+mutual+i%2527m+sure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410433/normal_6016b945456de.pdfIn PDF document text
    • https://fepanaxowa.weebly.com/uploads/1/3/4/3/134311119/2aeb0.pdfIn PDF document text
    • https://wigawiwamenusum.weebly.com/uploads/1/3/5/3/135323889/3dc5f0ec8e958d.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/haOjjgN/doodle_alchemy_animals_game.pdfIn PDF document text
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/25084.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/jEfhgji/death_drop_gorgeous.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_6050231612b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_6017e153cc4b0.pdfIn PDF document text
    • https://cdn.sqhk.co/rokogikapo/ieMEigT/project_management_methodologies_agile_waterfall.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_c6ec236ca25d4fdab9737c3da737ea1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/fmea_aiag_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/fixed_income_analysis_fabozzi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/porexakavazowejun.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/ekel_sheet_mask_ingredients.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/23350154128.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/90406599177.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/pepefi.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/aspiracion_de_secreciones_en_el_recien_nacido.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_ae86f8fea6474295aae49f6894d79239.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/how_to_replace_delta_seats_and_springs.pdfIn PDF document text
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_b225b5f2561a433baf94af15811e08d0.pdf?index=trueIn 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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 5088 bytes
SHA-256: 30a665d5d997bc3ceb97d87fae5348f8071690bf86e0ed57cf680be562d25b6b
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 10880 bytes
SHA-256: 9001cd9f057086dc5dd635939b429fe9a121f0458ddeacbe15a46e6399355f0c

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