Malicious PDF — malware analysis report

Static analysis result for SHA-256 286af716ae5ac2d4…

MALICIOUS

PDF

110.9 KB Created: 2021-03-10 07:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e8832e0a4e8b8f23310f56ce75367b6d SHA-1: 9b5aff455ba1b42fd380a01a0af0da44e84b50f7 SHA-256: 286af716ae5ac2d42b3297d66e9bd4b827e959fcef79bdd61fab1b77d8a9ba89
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs indicate it's designed to redirect users to potentially harmful content.

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://maypoin.ru/strik?utm_term=bands+of+mourning+hoid PDF link annotation
    • http://majexifavel.scienceontheweb.net/wastewater_engineering_treatment_and_resource_recovery.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/50008957601.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/hotsy_pressure_washer_pump_parts.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/philips_series_5000_nose_ear_and_eyebrow_trimmer.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/zanifepofexidododowuvum.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/fozodatexuva.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/wumufumanudefalupavejewo.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/48_thermador_refrigerator_for_sale.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/sazixipame/mufobefeminezitezakomigon.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/best_funny_political_quotes.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_60c64d4790ff419fbd6123724c7d87fc.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_fa92415716f542009e6a412192193710.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0617aece-1efe-429b-9f7b-6add6932828b/93234978737.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/in_all_the_bright_places_why_does_finch_kill_himself.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_00c6af564bd04f78bf8d7eb1bdaa3c0f.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_dd64414389364b95bc5e756948716496.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woberiz/39285029572.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_41f38f81deae449b9b6b4817e3812e4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f9008f-b363-4974-877b-dfb407baf51f/212_degrees_meaning.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_f231e01c2eb747399c51281f092598fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/what_kind_of_literary_device_is_exaggeration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2392fc-07e0-4c31-a41b-68c0ce1a292c/tipufirapabojilug.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165B1 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off000175a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A5 5340 bytes
SHA-256: 078c86193977bc83af2b44de4a411cdbacc76df3c1e8ca5df4082df714e8f238
font_02_sfnt_off000187a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A8 12016 bytes
SHA-256: 4a248fbf1b870637be0be57f89859ccb07176df6ab43d40ec7f1daecc9599d89