Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7435874c62ac658…

MALICIOUS

PDF

92.7 KB Created: 2021-03-09 13:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ecd337ff8861b93e3f2506e76940d621 SHA-1: c7a287a7c21cc2089ef4850d424b4dc4d99c1e39 SHA-256: b7435874c62ac658f89122d2e454c5e1f0e89040cf18b51cf51151a1100abd12
126 Risk Score

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 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=climatronic+self+diagnostics.+pdf PDF link annotation
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/0e1fa8c60.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/zokumesoj.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/fomuleraz_litepu_mofulovovur_rusot.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/c3G7KKL/gewuvokafilavidagiwugijuk.pdfIn PDF document text
    • http://tujofifebituxuv.22web.org/67376677897.pdfIn PDF document text
    • http://kunabote.22web.org/25948899953.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/d0b464.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/1535f7b99c5ffe.pdfIn PDF document text
    • http://vezadawebowa.iblogger.org/64588109777.pdfIn PDF document text
    • http://kokilubowo.22web.org/abhimaan_bengali_full_movie_480p.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/gfjiiAI/8971468097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witopovuketoj.epizy.com/apa_manual_6th_edition.pdfIn PDF document text
    • http://vuniwetare.rf.gd/nutezuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30611cd4-4d0c-4839-b584-1c604d647217/didibom.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/77884618796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f765b6f-44c9-4e04-bc70-888c4ec7cb87/dezorinijisebozud.pdfIn PDF document text
    • http://momedeturus.epizy.com/60370551182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f55c5b-b62f-443b-afe4-9e83d7cdd3cd/68344688989.pdfIn PDF document text
    • http://ruxexusuremabi.rf.gd/cognitive_psychology_faculty_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/sun_tzu_art_of_war_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/rofebalododobepajozi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/koriso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbea402c-0030-4148-be90-f7d1eb6b8dbd/mf_165_tractor_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/leguzudafewis.pdfIn PDF document text
    • http://sejabozewilobog.epizy.com/17813063170.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_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 3396 bytes
SHA-256: b6a7d12b3eaa664f809f498fbe7ac0efe51cdbd913dcf43e0dda2af6a5403fc5
font_01_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 5412 bytes
SHA-256: 50b6b48f3822ea924d9c47ca89888551ef7475b8e23a49710749db187a4cb931
font_02_sfnt_off00013f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F51 10920 bytes
SHA-256: db2384a3d83443c97624dbaeac93bb99a97cd07a3e96477e7a259e2690f48c81