Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4aa8e1b117f4a2…

MALICIOUS

PDF

78.7 KB Created: 2021-02-22 08:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b9714ebc2fe9081d6045e962c2e13236 SHA-1: 59600dea3071f79d75df44ed093676f02fc94ce6 SHA-256: ac4aa8e1b117f4a2cdb9d20de9572495a429de83a29eb9d48d5aa78b78a54b18
186 Risk Score

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 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 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://jottigo.ru/123?utm_term=where+can+you+donate+men%2527s+clothes PDF link annotation
    • http://bigakeka.iblogger.org/ravi_name_ringtone_song.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/gexovorulema_luketunodigi.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/muscle_action_and_joint_activity_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/dBJQiia/68322851569.pdfIn PDF document text
    • http://jesofazom.iblogger.org/averiguar_si_un_imei_esta_reportado.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/7061847.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/tgehdhc/vector_despicable_me_quotes.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/nuwufunawu.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/d3ca0.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/janijiderotajavu.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/e03947.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/Rghcwhc/91127450048.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/2017345.pdfIn PDF document text
    • http://repefokuxogefu.22web.org/olx_app_new_version_for_pc.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/9c63a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://konewumabujak.rf.gd/business_environment_book.pdfIn PDF document text
    • http://runapapaxezupow.rf.gd/55525113856.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/amandeep_singh_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/security_education_training_and_awareness_program_template.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5164 bytes
SHA-256: 5f4b613dd9a198f2943ca7e636ddf3258469530abe177b92237ebc80ba71e650
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10784 bytes
SHA-256: 93a201fbc5549e8ea03a062ae68acae7d7458f72f5bae746ddce2e38fc7c5a51
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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