Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf4fd1aa0a467b9…

MALICIOUS

PDF

86.3 KB Created: 2021-03-31 16:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ebbd9b46d451f8f48c384179939c58c SHA-1: 5ba091801ea8a216904e8fa22573ee1a11aac329 SHA-256: 7bf4fd1aa0a467b941c76cf17834c9f821440cc82547e327297ac5fca8a3961b
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=mount+katahdin+guided+hikes PDF link annotation
    • https://ratipiju.weebly.com/uploads/1/3/0/7/130740089/345729.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/english_punctuation_guide.pdfIn PDF document text
    • http://reassurez-moi-fr.info/beats_by_dre_powerbeats_pro_true-wireless_headphones_reviewcxeal.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://espaceclient-cmb.com/kugamoferuvixovuligunobotym.pdfIn PDF document text
    • http://copyrightshelpcenter.com/cyberpunk_2077_hdr_pc_not_workingz9sjq.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/lBLjbS3/75792473674.pdfIn PDF document text
    • http://swiss-family.space/c._s_lewis_screwtape_letters26dhh.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/26293742706.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/PN2xThi/dragon_kirishima_x_dragon_reader_heat.pdfIn PDF document text
    • https://sitadubudotewor.weebly.com/uploads/1/3/5/3/135335426/617840.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/Ogc9zia/formula_1_project_manager_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/eLrghJC/color_shades_for_instagram_highlights.pdfIn PDF document text
    • http://aarbuz.space/jaxeroxejvgist.pdfIn PDF document text
    • http://meetplafond.xyz/rains_of_castamere_piano_sheet_music_free6a4pw.pdfIn PDF document text
    • https://cdn.sqhk.co/kopupelek/EJgfXgh/76512750287.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/nopasegatu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukokovevaz.atwebpages.com/bihar_excise_si_syllabus.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/mogibaxanurijo.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_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 5028 bytes
SHA-256: 721d84dfe8a67d0260ea3831046435eb5711fdf8df60e0694d6c8efbb03134a6
font_01_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 11932 bytes
SHA-256: 730b6a4301a3c7c8135987efbbede6ed240654e190473bcd49064414cc2c6996

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