Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8df5fe194846e8c…

MALICIOUS

PDF

79.8 KB Created: 2021-04-01 08:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aa658b4091cea0adb4d00a485850a121 SHA-1: 54bd56a010693f6cce78b58a4f3fac1d43e87d45 SHA-256: b8df5fe194846e8cefaed3d80aff00d16902f671f652bb705e87da510afd3fe2
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 0.9997

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://ponafet.ru/wix?keyword=unit+7+systems+of+equations+answer+key PDF link annotation
    • http://kesisofawa.mygamesonline.org/browning_hi_power_custom_wood_grips.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/87271620110.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/wusobobu.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/Kibgiij/download_orbot_proxy_with_tor_for_android.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/architecture_microservices.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/english_nursery_rhymes_free_download.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/maposotusas.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/n1996_motherboard_layout.pdfIn PDF document text
    • http://pifadopagel.scienceontheweb.net/antinomia_significado.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/7382315.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/jigikakojipotebid.pdfIn PDF document text
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/0ac6e79070.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/1898478.pdfIn PDF document text
    • http://tikanaw.mypressonline.com/nodebazuwegizupukerubapa.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/65746909001.pdfIn PDF document text
    • http://dosefokinuvulo.mypressonline.com/gasekizi.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/vabadilewut.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/14610607378.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/QXhauKl/egg_finder_mod_apk_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sewamos/cutting_edge_elementary_workbook_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/34391039089.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/xibowete.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_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 5336 bytes
SHA-256: 81ac1780bb07baf22af74087a7b7238ed0b47da2d68e7413d2746f8f68658310
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 11388 bytes
SHA-256: 6182c6f78493ad84c8fc792a3f82e827689e1c8fe1b59f34651b25477e3a1a5a

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