Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63f4f2d42b505aa…

MALICIOUS

PDF

80.9 KB Created: 2021-06-09 15:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 533491aee6445c636bc6aa1cb1bd9c62 SHA-1: 46e48292d5356ca56c2ecc657993fff4c1cec1f7 SHA-256: b63f4f2d42b505aa2ef922c59cb5a43adbc957334f634d5a28a682bcba8a064e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://chcial.ru/pbw?utm_term=ghai+practical+physiology+pdf PDF link annotation
    • https://wugaxaxelapuwu.weebly.com/uploads/1/3/4/5/134595152/0650f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_600be2436dff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602fb9701a118.pdfIn PDF document text
    • https://pazinuro.weebly.com/uploads/1/3/4/8/134895037/6a53f2859b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_6064c27db789a.pdfIn PDF document text
    • https://fujikoxeloto.weebly.com/uploads/1/3/5/3/135307408/5355939.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/gemowama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_600e5ee564f66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_5fccec7028542.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/1fd6b9e0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijegazoz.pbworks.com/f/cost_to_replace_flame_sensor_on_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0daa9a-68f6-49bd-a382-ba0f11b464b2/rakobavumebobo.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144724824/ejemplos_de_reacciones_de_neutralizacion_acido_bases_en_la_vida_cotidiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a79c87-e5b4-4c1e-87e1-3fb75d31fb4a/22111089394.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144587280/xinolonowexuxokixudeme.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144476985/vakavozigibekupamibuzon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59196307-6fd8-48c2-a2c6-3f393b7d6a1c/kojomafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868df91f-e676-41c4-9b3f-bedea8472e9b/58119871632.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144810291/how_to_charge_tws_true_wireless_stereo_i12.pdfIn PDF document text
    • http://luwosotatex.pbworks.com/f/962858878.pdfIn PDF document text
    • http://newubotadov.pbworks.com/f/95199836300.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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 5548 bytes
SHA-256: b413654e791a5af6585cd79fcd528d0d03de311f51d5d52c0c90b88e72604703
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 10544 bytes
SHA-256: 825b25e4bc630d0d4ff1f0ebb472fa25e3ec389b7ff1f9280fd0e305e569bb28
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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