Malicious PDF — malware analysis report

Static analysis result for SHA-256 b405edb76f5ede21…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 08:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 46137235d5f81fecd8c968591b97487d SHA-1: 235da77e2e42b110540b36ab45ba7da6c061447b SHA-256: b405edb76f5ede2107d4ad98247bbfdf6a41f9a952a577d942057960d27d8168
186 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 0.9999

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.
  • 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://nipisod.ru/wix?keyword=toshiba+tv+user+manual+download PDF link annotation
    • http://bristol-yalta.run/how_to_get_ripped_abs_diet_planznp7i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_60350fd0a285f.pdfIn PDF document text
    • http://ru-order-687646765445.art/study_skills_for_high_school_students_worksheetsf0v18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_5fd8e8337c893.pdfIn PDF document text
    • https://fuduxudeki.weebly.com/uploads/1/3/4/6/134606049/ed427044.pdfIn PDF document text
    • https://najonetawo.weebly.com/uploads/1/3/4/5/134522785/nopepasopodifelo.pdfIn PDF document text
    • http://nukels.xyz/dokemudasedija2oy44.pdfIn PDF document text
    • http://umkatrade.ru/tissot_t-touch_connect_solar_titanium_mens_watchix40x.pdfIn PDF document text
    • http://erogan24.website/28922083234hb3o2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_5eeabf3192c24279b695b4dae7f60a9c.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_9471fcbda416445fb7f3a95f6184421d.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_0432e8ffc890455bb4ee831a2f9232e6.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_473d077e341240e48396996a2c47319c.pdf?index=trueIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_10957b4a64d54e85a9c32399d4264775.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed74b31-006f-4bdd-b2b5-d7e47d489dc0/57447162635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db3a0ce-71cd-47f4-95c0-11167cce65da/hp_photosmart_5510_not_printing_black_properly.pdfIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_850fc036afd94181a922e27bea595fb7.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_8d4eca98d4e34abbb070a5d9a5d51c0b.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_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 5308 bytes
SHA-256: 227c79536c29020e8e39f33ebdeca8e5af45d3a4c31560b4be4a489d2593e6bb
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 10744 bytes
SHA-256: 659732ae51252fe8a5ec4c2fa9b714d147c62341c5a91b5393bed6d6db1af011

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