Malicious PDF — malware analysis report

Static analysis result for SHA-256 92fdd9ce049c5048…

MALICIOUS

PDF

77.5 KB Created: 2021-05-01 15:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a23447e54dc2f0a3f437ac401c85919b SHA-1: d9d76642b2e6a7493765abc3112260b2ffd6498e SHA-256: 92fdd9ce049c5048cdce5defbba42d2bdb7dc31ca3a56935f404a89f65ef955d
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 0.9998

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=how+to+practice+plc+programming+at+home PDF link annotation
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/95e4601a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_600e974009839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601712029783c.pdfIn PDF document text
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/vagobi.pdfIn PDF document text
    • http://botefin.medianewsonline.com/glossary_of_banking_and_finance.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484821/normal_5ffdc313ef3d2.pdfIn PDF document text
    • http://xuzotudaraderuf.mypressonline.com/kekodegolizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_6066b9372da5a.pdfIn PDF document text
    • https://rutimupon.weebly.com/uploads/1/3/4/6/134629179/labetikeduzezoravu.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/bipovoromoj/money_supply_m1_m2_m3.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/cacao_powder_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/fortnite_cheat_sheet_boogie_down.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/california_king_fitted_sheet_measurements.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/76809029665.pdfIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_520d59df7cca4cd28ba34b28a9f77101.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/salary_of_a_housewife.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_9c2a4afc02084520abea3f4a9cba1c53.pdf?index=trueIn PDF document text
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_78c854935da64bd09d85041f8ca59165.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/burger_king_fries_ingredients_2019.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_e5c711fefd8345218ad799dd83e415a0.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_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 5220 bytes
SHA-256: f55217e3d6f968ccd703f1ff4905f3c62f642f39ac345a9b00163e258227d2b1
font_01_sfnt_off000101b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 11428 bytes
SHA-256: 62e82e9cf1fb6f2e139365b392402e625643203085a8fadf64b517fd6e3379d4

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