Malicious PDF — malware analysis report

Static analysis result for SHA-256 663a6dc898761324…

MALICIOUS

PDF

78.4 KB Created: 2021-04-07 06:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57f59d1ed4e3ab043eeaeed0f53d43e7 SHA-1: df41b76f342b7634e5beb617aefdbc169b6d8763 SHA-256: 663a6dc89876132423f4f97240a6bb459e0c7a5ef8ae2d7ea3b1ba57988ae256
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 0.9996

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://fokemale.ru/123?utm_term=acidifying+agent+pdf PDF link annotation
    • https://cdn.sqhk.co/feketukadoz/jjSiggf/97851695243.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/jfTodjh/themes_apps_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/vivutazawi/lidakha/matofamul.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/qDjcycJ/luke_bryan_new_song_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_6018be771be5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426413/normal_5fcaf8cf4a74b.pdfIn PDF document text
    • http://esagafow.fun/dobetigir3ab6t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5fcd680d7aa9f.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jbifhgn/2nd_grade_math_worksheets_addition_subtraction_regrouping.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/arjjXxT/gixubibukaw.pdfIn PDF document text
    • http://snt-br.ru/jazomoriligewexunujigatrf9t.pdfIn PDF document text
    • http://anyita.space/nezokumesowojaxapolegb1zrc.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/K5Ajb09/trial_xtreme_dirt_bike_racing_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_605be9beacf9c.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.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/cb57547f-600b-4a7d-95bd-17bdaa3b0778/sexajofuwasexejoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541adac9-badd-4e25-a779-d224f4199762/fearless_songs_taylor_swift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93aefe74-83e9-48d5-aa44-0c58432d5e97/probability_problems_with_solutions_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8b14fa-34f6-48ce-87b5-c2e3032a18f8/felopujoxad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b776e92-0ff8-44ac-b399-70cd574d24d8/44935383731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d62cf27-1e57-4915-8eaa-0be3bf30e127/11289153886.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_off0000f30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 5108 bytes
SHA-256: d6ec9f8a08029860acd81f57379698c8fbc8d12ea92d315bfaea2441f88075d7
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 11568 bytes
SHA-256: ff841c0e471030d0fa01b4703a13d05d0490dd2725d75dd3c6bb113d6068292f

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