Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e91f856e922a7e8…

MALICIOUS

PDF

76.6 KB Created: 2021-03-10 07:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 08bc448a926fa470e25a6552963d0dfc SHA-1: b232de2a1710bd14413166c0d1edd388ef2f05b6 SHA-256: 4e91f856e922a7e8fceae8d10848737f476b66026aad60bdd064c3d40fcf09be
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded URLs and heuristics indicate it is a link farm on disposable hosting, with a high ML score and ClamAV detection confirming maliciousness. The document body, though partially corrupted, suggests a lure related to QuickBooks sales, aligning with phishing or malware delivery tactics. The presence of external URIs and the overall structure point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vilenefex.ru/strik?utm_term=how+to+record+a+sale+on+account+in+quickbooks PDF link annotation
    • https://cdn.sqhk.co/waxobakal/iiDggih/vikings_ivar_wife_pregnant.pdfIn PDF document text
    • http://lifeit.pro/20458135357yq0k.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/jgfjiij/rocky_horror_picture_show_music_list.pdfIn PDF document text
    • http://2020coupons.info/math_magic_workbook_class_4k6thx.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/45147885975apgnx.pdfIn PDF document text
    • http://biomanix.best/alaipayuthey_full_movie_in_1080p47rkx.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/hgIhfS7/ejercicios_de_movimiento_rectilineo_uniforme_wikipedia.pdfIn PDF document text
    • http://bonus332.site/27745096970ws60r.pdfIn PDF document text
    • http://parralax.net/nebevenokibilpg3t3.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/2702069889.pdfIn PDF document text
    • http://rodina38.ru/futipugliui.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/z2igjgv/beach_buggy_racing_2_online_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/hdihAjc/car_rage_fun_road_trip.pdfIn PDF document text
    • http://cryogen.me/crabbing_report_barnegat_bay_nju8pkf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazusoketa.epizy.com/91934748552.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_5196c84490c44c2e8dda73458c149ef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e99577f-c2c3-4c9c-87cf-264541a1bf4f/guardian_ad_litem_california_personal_injury.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8915fc-bb0b-4f18-a450-da9077ef5b28/fikeserudasisi.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_0002037434674dbe954985d4cd0385fe.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_f6f0a808ec9e4f2b8a478682602c83da.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ddeca5b-6d60-4d3a-8e71-f8cb9b7ac41b/project_management_institute_membership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb1878c-521b-454d-9925-29088f758944/transformer_sizing_calculation_formula.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/bsc_nursing_online_form_2019_rajasthan.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_b3082a6d2c1342dfa1eefdceb6ad4c17.pdf?index=trueIn PDF document text
    • http://muberugaguto.epizy.com/man_in_the_high_castle_ending_explained_season_4_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58763698-2713-4c91-80e4-9495d3316f76/33942634880.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_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 5316 bytes
SHA-256: 5246635e59dae91922b59eed277925c38870914594c0db4043a01ad22e32037c
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 10372 bytes
SHA-256: 7719f2b96c4dd7fd80f956576a5ed13db781c64f601e0debd04b509cc90d2a65

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