Malicious PDF — malware analysis report

Static analysis result for SHA-256 df47bf07876e0a0b…

MALICIOUS

PDF

101.5 KB Created: 2021-03-01 07:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3237c075026a1fd77169a44ea1b1eb67 SHA-1: 9230d113b9a4209bfd5d3caedfcafc13c60f8c41 SHA-256: df47bf07876e0a0b7f01f642b1e55e7a71dc38340e4a07ef8496254a900a1ff4
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 0.9995

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://xajibur.ru/wix?keyword=usnisa+vijaya+dharani+sanskrit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5fc99117ea415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fd6449d168e9.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/19627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_600d5ca98a310.pdfIn PDF document text
    • http://nutristrike-shop.ru/sojoralif6bjm.pdfIn PDF document text
    • http://mignonette.space/what_does_duty_to_god_mean_cub_scoutsomkie.pdfIn PDF document text
    • https://wazufepema.weebly.com/uploads/1/3/5/3/135383665/kijap-gusim-tebekumatan.pdfIn PDF document text
    • https://bolukuja.weebly.com/uploads/1/3/0/7/130739437/siwebuk.pdfIn PDF document text
    • http://ver-alex.website/habitat_acropora_formosa6t7q6.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/9589223496.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/orbit_irrigation_valve_solenoid.pdfIn PDF document text
    • http://neo-tp.ru/86390458775qnyp6.pdfIn PDF document text
    • http://lotsmen.com/bodmas_worksheets_for_grade_47sasq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5fe3b0cba4fee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/tapujotusilanipuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000129d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x129D4 7036 bytes
SHA-256: 638cca574e843fdbc253615e8ffe1288c72ac91698fc4d61cc1276b77439cfe4
font_01_sfnt_off0001414e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414E 5172 bytes
SHA-256: 511e029e436cd6cbe33bb6aaa8a92cb5c912fd0f63322158ab033513d14dcee8
font_02_sfnt_off000152f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F1 10572 bytes
SHA-256: 18881f23428c8aa4e0131a53a40920823c646c06e4206b2fe7fe0d63005ab74f
font_03_sfnt_off000176b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B3 4052 bytes
SHA-256: 595ac23e6c3bd2e8cc752e2ffadbe01946bcb9a7a30d0af26cd25210446e64ed

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