Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec99502ca730e05…

MALICIOUS

PDF

153.8 KB Created: 2021-03-13 23:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a58d4f39db135c0250027fff3e5f4e42 SHA-1: 946bdd4cf70a279b82207e129559ade97ce1873e SHA-256: aec99502ca730e05720fe86aebd0c550859ee43befa4ab62d0c0a231186f2189
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9985

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=the+chocolate+war+manipulation+quotes PDF link annotation
    • http://xteenware.online/dd_5e_dungeon_masters_guide_reviewtwht6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_60145211d2c25.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/ihhfjig/crossword_jam_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/ahWyghb/jetpack_joyride_download_android.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/how_to_avoid_plagiarism_in_academic_writing.pdfIn PDF document text
    • http://onlineeshop24.xyz/how_long_do_you_cook_ribeye_steaks_on_a_george_foreman_grillrm1sp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_603ac8e1058d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405419/normal_60010ea7ad01d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_6001d971133ad.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/ihggbge/kegimaso.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/application_pebble_watch_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/LSFijjj/vewuletisokeburez.pdfIn PDF document text
    • https://cdn.sqhk.co/nugubirudif/RjbiNfc/1n4740_zener_diode_datasheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_6032827e31666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_6012882cae189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601f1b1b50b9a.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/xuride.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6021ce4a675d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_60410172124a1.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/divexikav/91240342805.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/72412570895.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/65926258537.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/invoice_template_free_iphone_app.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/8782411964.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B7C 5340 bytes
SHA-256: ddec7882241de2cea5dae61e8c786066f5ac8adc706ba9226b0c631e07d424c7
font_01_sfnt_off00021d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D8F 11208 bytes
SHA-256: 35506f300d6842e81f8f52f6f5f00ba2ec56a8f38a39d18776bcbfdc4ee42367
font_02_sfnt_off0002437f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2437F 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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