Malicious PDF — malware analysis report

Static analysis result for SHA-256 937839d1b0852688…

MALICIOUS

PDF

73.9 KB Created: 2021-04-04 18:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 47b46d6d4376649226d4049dda7b1968 SHA-1: 118f526994fa32aca35ee27980e93e8539cd5167 SHA-256: 937839d1b08526889125197d9e33c8cf9aa85014bdbed17564240e5c9b0cda5a
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=ed+sheeran+castle+on+the+hill+lyrics+az PDF link annotation
    • https://cdn.sqhk.co/rinugezig/73thb5h/gasimomijifuzani.pdfIn PDF document text
    • https://sebaderibegagib.weebly.com/uploads/1/3/4/5/134583030/5504964.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/4257506.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/3b235b7e5542e.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/magife.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hd5JFyM/the_university_of_hong_kong.pdfIn PDF document text
    • https://nuzazetoxulo.weebly.com/uploads/1/3/1/6/131636602/jekimase.pdfIn PDF document text
    • https://xezajorawelo.weebly.com/uploads/1/3/1/4/131408008/20654f0e3ea1.pdfIn PDF document text
    • https://noturumon.weebly.com/uploads/1/3/0/8/130814868/darobokuboverojo.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/TfiaihR/twitter_video_downloader_apps.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/rukobulured-begakitaduziwo-xuxejugenipib.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/6817593.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/LMhjbhd/badlapur_full_movie_123mkv.pdfIn PDF document text
    • https://tozugijojabam.weebly.com/uploads/1/3/4/6/134640227/nopewivip.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/hiS5Sj0/3926060985.pdfIn PDF document text
    • https://fokepepepaxa.weebly.com/uploads/1/3/1/4/131483327/7fc50.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/jenagubadopi/intermolecular_forces_liquids_and_solids_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/battery_tender_power_plus_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/89228064110.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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 5136 bytes
SHA-256: eddf17b02cf185c78a70f5ef31dde3f200dd7a23033459c587d2fda68aeeac6d
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 9780 bytes
SHA-256: 88d289cbd0cac4ffe99f6d4819c93c6e374069def825d63cd0c3275e48c4cb56
font_02_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 16068 bytes
SHA-256: e7273338525a866f49bd556f13a0e46ce1e8513f85f175d9d987aa1f8b89adb9

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