Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ebf8798554e3dd…

MALICIOUS

PDF

78.4 KB Created: 2021-03-31 04:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb3d4cd78eac4c8fcd3aefe931a88ac7 SHA-1: 5d8d23cdd7091898b566b50168ecbe8249ac7b68 SHA-256: 52ebf8798554e3dd9e324dd61a14514df0a7072580a0eb27ab4a430d23c57ff8
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 0.9992

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://xajibur.ru/wix?keyword=seven+twinkling+tweens+ellie PDF link annotation
    • https://cdn.sqhk.co/tibapopedeka/hicZieE/download_plants_vs_zombies_heroes_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/theZgid/semedugiditej.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/bujijifa_zagevudaba_molikiduvipe_zejube.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/hiDwCgU/nakap.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/45f6ca7.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/64309653097.pdfIn PDF document text
    • http://moscow-siberian-force.online/international_business_machines_ibm_corpqb9hu.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/6272528.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/yigHYhf/gurokivosedorime.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/GyjbtMv/sample_corrective_action_form_template.pdfIn PDF document text
    • http://steblin.pro/table_b.2_of_the_wais-iv_administration_and_scoring_manualf8my0.pdfIn PDF document text
    • https://cdn.sqhk.co/kakezesarop/BpieiaW/5574136619.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/gyjajgS/peculiar_mo_police_report.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/fjhjdYa/jexivekutapopabapukebo.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/34dcfc63fd.pdfIn PDF document text
    • http://labincom-med.ru/47175768406267b4.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/ehbibjj/epic_books_icon.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/telasebisu/android_10_update_nokia_6._1_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/fishing_report_barren_river_lake_kentucky.pdfIn PDF document text
    • http://xedemigu.atwebpages.com/ruwobivofemifonedekujo.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/cake_recipes_files.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/how_to_learn_more_about_the_stock_market.pdfIn PDF document text
    • http://pekomuvave.myartsonline.com/teeter_hang_ups_inversion_table_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/gamaxegunadaruvetorosi.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/best_chess_books_for_beginners_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 4868 bytes
SHA-256: 05a80c1215c15684518f2beea6f659637d0c2659d5a55ce0379364d4aad1df83
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 11488 bytes
SHA-256: 8c2b6fc2e8e82d390514177e46b19f8eb3b00cbf80f49df801008a6e64a6565d