Malicious PDF — malware analysis report

Static analysis result for SHA-256 528ed433849bf0cc…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 14:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c81983aa6dbcd504f9652b8119948c9 SHA-1: b91153703e799dadd1efc616091976644e149d77 SHA-256: 528ed433849bf0ccfdce0e5068e83fb234f1b89ff903f35959b14c2db8dbd3ec
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 0.9964

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://zajinet.ru/award?keyword=a+pocket+style+manual+apa+version+7th+edition+pdf PDF link annotation
    • http://gisoboxizaza.mygamesonline.org/97334354164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_6047e1d562bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445550/normal_60220606a84bc.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/john_deere_gator_hpx_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_605b07278c3ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386621/normal_5fdd951bcc6a3.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/blackmagic_atem_television_studio_hd_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_60110cc579b7d.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/what_are_good_books_for_14_year_olds.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/behind_closed_doors_telenovela_actors.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/35219297795.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/tolefidukapavaxuji.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/drum_rudiments_poster.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mojilozijidula.epizy.com/dipirevavuzil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb126ae4-7c0d-4f30-bc17-6569ca3df999/26638107305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f53b67-300d-46ec-a7e2-dcf9abea281a/visual_basic_6.0_software_free_download_for_windows_7_32_bit.pdfIn PDF document text
    • http://xowuzaxu.onlinewebshop.net/technology_risk_management_framework.pdfIn PDF document text
    • http://tojuzogip.myartsonline.com/zifimi.pdfIn PDF document text
    • http://bidejepeko.onlinewebshop.net/rinewuxuxurivenelafe.pdfIn PDF document text
    • http://malajusojak.epizy.com/freenas_ftp_setup_guide.pdfIn PDF document text
    • http://nidedos.rf.gd/kinobody_superhero_bulking_program_free.pdfIn PDF document text
    • http://dawivek.rf.gd/masixes.pdfIn PDF document text
    • http://masovuv.rf.gd/9197217790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acac282e-0212-4e2f-90e6-8c2da6d20718/anthony_de_mello_happiness_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1ed173-f1c1-4f19-9efd-944fd913f1fe/lajubaxole.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/black_nobility_bloodline.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/imdb_happy_endings_grant.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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 5692 bytes
SHA-256: fc773750734fb1dfc5cddb69078ec6a59b210c16b890ac95ff7e57dbb6e2173e
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 10924 bytes
SHA-256: fcf348941111052fbc4e06b1f92c6772ca7667629bdc973ea7441ae96562ac84