Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a91f990cbc5fd9…

MALICIOUS

PDF

78.9 KB Created: 2021-03-27 18:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e31dae032a4ed01be70123c037fe6c42 SHA-1: 08d777132383c4bfd9f69768d20e2a56e95b3a9f SHA-256: 01a91f990cbc5fd986143c683730165dcecc52eb901a81b2dcd5dd6465eddb39
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary URL pointing to a link farm designed to redirect users to other PDF documents. The presence of numerous external links suggests an attempt to host or distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/123?utm_term=clinical+swallowing+evaluation+sample+report
    • https://cdn.sqhk.co/mivufarowiwi/gjb5Rgc/zetixejewirafimewijeduje.pdf
    • http://vorakumezaxof.mygamesonline.org/gapufipidanuli.pdf
    • https://nimukitu.weebly.com/uploads/1/3/4/2/134266418/dutifadar-zarop-tuzaganusodi-redobu.pdf
    • http://all-system7.work/closers_online_leveling_guide6akpq.pdf
    • http://gopidap.scienceontheweb.net/28268017744.pdf
    • https://labafapagitef.weebly.com/uploads/1/3/1/6/131637364/jarunap.pdf
    • http://ppl-nutrshopfit.website/43140389635w5fmb.pdf
    • https://neberesoz.weebly.com/uploads/1/3/4/5/134512227/5958d4c6f38b9.pdf
    • http://gosepakaf.getenjoyment.net/bladerf_x115.pdf
    • https://cdn.sqhk.co/bitaxukezor/5Xv2oWw/ddpai_x2_pro_dual_dash_cam.pdf
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/da49cc1f46544b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://samesesodore.onlinewebshop.net/10556923673.pdf
    • https://uploads.strikinglycdn.com/files/3cff7bed-677c-4c18-b006-441e77791d3e/rewujevabuxafofuvozapenu.pdf
    • https://uploads.strikinglycdn.com/files/ebae87dd-4d24-4115-af71-b0737d1ca949/white_string_christmas_lights_walmart.pdf
    • https://uploads.strikinglycdn.com/files/d270b414-f8e5-49b0-848e-23e95b3f1414/lotemizew.pdf
    • https://uploads.strikinglycdn.com/files/7fc62fc8-36a4-458b-9e51-d6678c123c05/is_there_a_template_for_a_family_tree.pdf
    • https://uploads.strikinglycdn.com/files/ec682a62-f8af-47a6-a3f5-ae2230959580/kexaruvunuzawiju.pdf
    • https://uploads.strikinglycdn.com/files/9468f341-d13d-4177-aabf-886738179a97/playstation_3_controller_price_in_south_africa.pdf
    • https://uploads.strikinglycdn.com/files/1eaf91eb-1537-47a7-b09a-2f47a8651c91/lulaguvozamudu.pdf
    • https://uploads.strikinglycdn.com/files/de858e30-a708-4e06-a8c7-caabe197b5a1/who_are_the_characters_in_a_christmas_carol_by_charles_dickens.pdf
    • https://uploads.strikinglycdn.com/files/945ea101-c3b2-4b02-8559-b44c6dd5125d/91027150878.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f660.bin
5161fb47d6eb990734a22baac21e08c74b9912313d4e9d8a8d8eec0d949d62bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 5308 bytes
font_01_sfnt_off00010873.bin
6a4a6bad583573a66a11e30d9c18f021da7574cb5ec7082572b51ffcd3e7c0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 11156 bytes

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