Malicious PDF — malware analysis report

Static analysis result for SHA-256 f521415c05fce24a…

MALICIOUS

PDF

92.9 KB Created: 2021-04-14 16:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 504cc0cd488dee1c02b80e2d83eb7752 SHA-1: 1be197dafb2648bf965903b872e51f5efcd175bf SHA-256: f521415c05fce24aef188ed24f25f1eeb14e26184033b2d39fd3b995d19eae85
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=fish+farming+in+maharashtra+in+marathi+pdf PDF link annotation
    • http://giwewigipebi.medianewsonline.com/beatles_classical_guitar_sheet_music.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/punctuation_marks_worksheets_for_grade_5.pdfIn PDF document text
    • http://xozonline.ru/16680067182jgb8o.pdfIn PDF document text
    • http://top-shop-store.website/bookworm_adventure_crackihg1f.pdfIn PDF document text
    • http://gbo.guru/download_desain_t-shirt_-_snaptee_apkjb6kl.pdfIn PDF document text
    • http://lady-bug.club/11879974247lgodf.pdfIn PDF document text
    • http://delalikifavaru.iblogger.org/define_job_cost_sheet.pdfIn PDF document text
    • http://ttttrrrr.space/format_sql_server_management_studiouxk3z.pdfIn PDF document text
    • http://duxuliba.22web.org/37752962362.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/trade_company_profile.pdfIn PDF document text
    • http://guditoresuz.22web.org/47193544962.pdfIn PDF document text
    • http://cmbclientes.com/how_to_make_your_first_million_warren_ingrameteo5.pdfIn PDF document text
    • http://instapodarok365.site/10122507366z2ihm.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://fedorahosted.org/lohitIn PDF document text
    • http://kabutusagop.rf.gd/26097439288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3230e9-aef9-4bcd-b00f-b559e71f0125/jibafosimekejago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1941f5dd-2937-4bfe-abc5-e05ff5d50f17/57593882392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc60650-1902-408e-ac2c-1788a551545a/for_dummies_book_publisher.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/xukovuwol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21479fb4-f2e7-44a2-943f-01dfeec732ab/headrest_for_herman_miller_aeron_chair_-_h4.pdfIn PDF document text
    • http://senisiluni.rf.gd/muwomukifopotosugelobazor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd4b0c2-47f4-4eef-a9db-d29a5fb66241/xosori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86e4e29-9206-4146-9af9-40c62e045376/first_grade_math_practice_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08d3884-d8fe-43d4-9582-bb60824f8bff/baby_jogger_city_mini_double_weight_limit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 4936 bytes
SHA-256: c5094474a1c4988a62c783ac38f87085f907335cef44ef89551274cf2663c6db
font_01_sfnt_off00011fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCA 11720 bytes
SHA-256: cdc1eaa9d1af5a44c9c09b8da5ab6c4f11a493d3cb5485957a8e00027cbe0d5e
font_02_sfnt_off00014761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_03_sfnt_off00015561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15561 4180 bytes
SHA-256: 72c19a634eec7795598d6bdefad07514f2c9185ae857540082db3569521807c1