Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86ecaee958c35d9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 04:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 184caddc5d5f121a8edaab867bdeb5b8 SHA-1: 6a3c566b2fbe5f3b1eb809b4a9634cbcd1e571a3 SHA-256: f86ecaee958c35d92b7548392abe2c8d22f6134f37391f6f812444c571432ec5
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 0.9996

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://midufefew.ru/award?keyword=livro+o+biocentrismo+pdf PDF link annotation
    • http://christinaanddavid2019.com/gupovogimiduxikevwh3oh.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/88027473206.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/porter_cable_air_compressor_c2002_drain_valve.pdfIn PDF document text
    • http://rodina38.ru/gdt_11_manualwjewp.pdfIn PDF document text
    • http://livethailand.fun/estudios_de_casosoerky.pdfIn PDF document text
    • http://pedalini.club/669716699251uixk.pdfIn PDF document text
    • https://vufegolafo.weebly.com/uploads/1/3/0/9/130969987/rozuwiw.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/wiwobimidom.pdfIn PDF document text
    • http://nazhivy.net/tascam_414_mkii_review0jtmr.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/wapetubaseko-xuvezozoz-kufepovidagi-tijurudasobanip.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/80817741627.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/schaums_outline_tensor_analysis.pdfIn PDF document text
    • http://medgaj.com/why_did_the_north_supported_high_tariffs1wlr6.pdfIn PDF document text
    • http://copyrightshelpcenter.com/penexopegatuqfco5.pdfIn PDF document text
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/1022905.pdfIn PDF document text
    • http://kamini33.ru/32822015077nf7b8.pdfIn PDF document text
    • http://lnstagramcentre.net/gafedexj6t.pdfIn PDF document text
    • http://mx50off.pro/wuvepamisuzovae70v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/ice_breakers_duo_mints_strawberry.pdfIn PDF document text
    • http://wififeju.atwebpages.com/valumixozenajidedolo.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/biradudomebulilerovuzo.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/66149473025.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5200 bytes
SHA-256: 88095c89710ec5ba748008baad20d9f338ce7589713491d85720af284ca8188b
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 12520 bytes
SHA-256: d500136195d667f004505c38963a6ba9f1d180b47f9682139f95360aeac2e740
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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