Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b31ae0cb0825fc…

MALICIOUS

PDF

88.1 KB Created: 2021-04-11 02:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6a7c6eba365830e6a59f102404a0d1a SHA-1: 14f25c6894ed32c02dde02be57578a4348ed099c SHA-256: 33b31ae0cb0825fce56b3fae0894e7c9ed9084fd72c174a580e8b7be5ea4316f
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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=baldur%2527s+gate+2+single+character+guide PDF link annotation
    • http://xbet1.fun/8395795406xkurb.pdfIn PDF document text
    • http://vafutixon.22web.org/15108401228.pdfIn PDF document text
    • http://blog-uniswap.org/119071234112y0b.pdfIn PDF document text
    • http://nipikul.22web.org/debit_and_credit_accounting_template.pdfIn PDF document text
    • http://zilofunawoson.iblogger.org/is_there_a_grace_period_for_license_renewal.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/244631765.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/libro_arqueologia_del_saber.pdfIn PDF document text
    • http://jamisixed.22web.org/86426794783.pdfIn PDF document text
    • http://xovipidadodixo.iblogger.org/national_sewing_machine_serial_numbers.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/sojafuvumupijosulipu.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/moultrie_trail_camera_flash_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sagisat.rf.gd/50447331159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1bffc3e-69fa-492d-9fb6-817d00a42f8a/15423431718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3dd68f-9b03-4335-a4ce-42d6d7c08a7a/95729354573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05918abf-265c-43f4-aa80-007265291824/danielle_steels_safe_harbour_movie_youtube.pdfIn PDF document text
    • http://wakerot.epizy.com/challan_281_form.pdfIn PDF document text
    • http://rojaxenutu.rf.gd/do_jehovah_witnesses_not_celebrate_new_years.pdfIn PDF document text
    • http://punolubumima.epizy.com/afcat_answer_key_2018_official.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa31a7f-9774-417e-bb5d-22fdebe9d2a4/60231753621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb79fc60-41a5-4ee3-8718-cc20b1409d4a/helter-skelter_definition_webster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5edec5f-9426-4ce4-b55f-8ace88cb97b9/rafuvofafufafujogowoseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbdb0d8-c868-4fc7-9111-2bcd77f50208/16926651304.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/zojubimapeduvexobajem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D79 5188 bytes
SHA-256: b4826f72997899e456331113bbade44f8c0a1d298b73252e85b2af0dc4b8df22
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 11048 bytes
SHA-256: 871e0021b15a8519f0b5b1245f27415dd8e850a9a50c195132de5df97718c0e9
font_02_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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