Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e3798871402687…

MALICIOUS

PDF

149.3 KB Created: 2021-04-26 23:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 86868ea3b640583be7741c15b87b52e2 SHA-1: d5826e50a5135b012c6cc2f6899df40b4a7e9b30 SHA-256: d9e37988714026870069acbd3a46778dbb63588dab6431f8190994b2c006e73b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely related to spearphishing.

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://druttle.ru/strik?utm_term=underworld+team+ability+heroclix PDF link annotation
    • http://tadosuzewamu.medianewsonline.com/nursery_rhymes_lyrics_for_toddlers.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/1009769296.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/anYgL5T/swot_analysis_marketing.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/jiidgdM/25457347708.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/bexavadimezilederenuleve.pdfIn PDF document text
    • http://laserisesiseno.getenjoyment.net/subtracting_integers_quiz.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/4771276794.pdfIn PDF document text
    • http://zozitaze.mypressonline.com/5th_grade_math_volume_worksheets.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/how_to_write_cash_book_sales_register.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbba5400-dfcc-4ee5-9dbd-cf12af78a933/53674221970.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/makalah_akuntansi_manajemen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa000a6-31d5-42c2-bc83-c7e038a3a57f/church_emergency_action_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5ff776-7cf1-463f-9a2a-9e2ddd62745a/zalesit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2493f64a-2c0d-49b4-b02d-fab00b64b51b/riwabeniroba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14261bcb-dd63-4523-94a8-cbb61b82dc75/34302948360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d44b2e2-ceaf-441e-aa79-2a8a015e1f5c/52443639615.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/zabilafelasovuvitikiwovi.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_off0002029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2029D 3048 bytes
SHA-256: cfed08507e8f5466f7bf2e9c1fa9030337ffbd960c5478edeea582ae32c785db
font_01_sfnt_off00020d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D66 5392 bytes
SHA-256: 27c0e2aa6356ff66f3b540746138eef5c1f7e7f46967f264244ba94c842cb778
font_02_sfnt_off00021fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FAD 11640 bytes
SHA-256: f7b9ca332d0d0bb32b0e3ee27499f80c3af590e1b8fbefe424670aad30ea5d7a

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