Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4762731eb239d37…

MALICIOUS

PDF

79.6 KB Created: 2021-04-20 05:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 883f4618affa1210b98cffa7ada093c7 SHA-1: 47ba3c423e4fc9ea1dd5280f3b5952012dc09a5a SHA-256: f4762731eb239d37cfdabf7cf8855c0bf689c133105f27488ba5d9bef627d189
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 0.9996

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://mezovuduw.ru/strik?utm_term=diagramas+de+fases+de+un+componente PDF link annotation
    • http://fakts.design/76568439403u0ngc.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/15581535507.pdfIn PDF document text
    • http://creditscoreusa.info/nobegogasetativosenutepffpu2.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/zafanofagux.pdfIn PDF document text
    • http://alcexpress3.xyz/2669362966087kgu.pdfIn PDF document text
    • http://tuimag.ru/sentence_correction_worksheets_6th_gradeyvy1m.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/5iiijF9/pinball_lucky_strike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461207/normal_5ff357054deef.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/jhjchjH/dog_runny_poop_for_a_week.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_5ffca9e5e9848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_60681cbc97403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugosabogakeg.rf.gd/77903827472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299c433d-d909-4a75-8ecd-a05ca2471033/94884772302.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/damodarastakam_download.pdfIn PDF document text
    • http://fapizof.rf.gd/76046040870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea108ee-81ee-4606-a662-11388ce1f984/36212015709.pdfIn PDF document text
    • http://zunuzetipe.epizy.com/how_to_reset_the_maintenance_required_light_on_a_2003_honda_civic_ex.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 7252 bytes
SHA-256: fe94f886c6ce0c668414d527a008988b10337a330a8979ccbc2ccaa299d00954
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 5440 bytes
SHA-256: ffaa180e0b1bce4272d7277fab63f265e98d53fe327ad4d673caaf58d0385e6e
font_02_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 11984 bytes
SHA-256: fbe9aba1b06a657a1f212bf0a90c388d3c7f9b944276f53e7a32a75ce2c21a26
font_03_sfnt_off000119ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AD 16112 bytes
SHA-256: 275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399

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