Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b09e80cf4a614db…

MALICIOUS

PDF

85.4 KB Created: 2021-04-01 15:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2a938d267472ac2bc0f67835964ca4bb SHA-1: f2c1adda339d6ed76aa1f286f890b45507acde79 SHA-256: 0b09e80cf4a614dbfd28955a3c13995e100aa9dbda40680489e4494332d69fdd
134 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards a lure for downloading a secondary payload, likely disguised as study material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=acca+f2+study+material+pdf PDF link annotation
    • http://lamorebeduzakoj.22web.org/geregawimatinuvetozarebev.pdfIn PDF document text
    • http://kulirefibew.22web.org/tukokidowuvapisi.pdfIn PDF document text
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/262861.pdfIn PDF document text
    • http://derewopenila.22web.org/wilufoxikawudisatu.pdfIn PDF document text
    • https://bituvawidosudi.weebly.com/uploads/1/3/6/0/136081872/sapur-xuvam-tunidobozulesi-kasomuwemer.pdfIn PDF document text
    • https://lejufonibo.weebly.com/uploads/1/3/4/4/134470114/wonupazazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livofikozenaduj.rf.gd/decorative_aluminum_sheets_canada.pdfIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_66743f6c910d47709b0973353fda0e4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6f3bac-a7c3-429f-8cc6-fa3ab40772f4/49263435568.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_a4f0d297799746f4a2917155fcb7710f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/lokiwexesug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/966c8cda-e596-47ad-a994-da8a7869aa77/what_does_take_3_tablets_daily_with_a_meal_mean.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_9a0c16de4d474f4d80ed898992f50bdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/078970ee-e3da-45b8-a0f0-1912ab66a9d0/which_dried_fruit_has_the_most_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9293a8-7c1d-488d-b64e-656d93236819/what_are_the_four_requirements_of_natural_selection.pdfIn PDF document text
    • http://fotopokidag.epizy.com/ferragamo_loafer_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/wovidumeriruloror.pdfIn PDF document text
    • http://senajukuwizef.epizy.com/desewibapatusodaluju.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_28e7d11c0ca74fdd86d94fd89b106e00.pdf?index=trueIn PDF document text
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_9dc41f947a2c47ab9500554dba2d6326.pdf?index=trueIn PDF document text
    • http://zomufebike.epizy.com/excel_lookup_function_from_another_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b36252-f2ed-4ee8-a26f-b7852d00b84f/how_to_remove_coffee_stains_from_carafe.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/faleki.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 5524 bytes
SHA-256: 9947881c1523be15cd93f0121ab2cc004f353a3ed6d7d58421648464984e79a8
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 2472 bytes
SHA-256: ff7684c8bc4fd86d87c3e20eedfec5b2f60b990c8afaed0d8ea222120c83c35e
font_02_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 10416 bytes
SHA-256: dee9fe081daaf495ed0e6c7608b7e2bbd38c27fb2105b3f61ac626c8605608d6
font_03_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89

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