Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf5db655c6f28d5…

MALICIOUS

PDF

68.0 KB Created: 2020-11-12 20:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67d2d35946d9c6cef00176b420e1256 SHA-1: d73519d98aa31698d6543fe4537c11da58933dcf SHA-256: ecf5db655c6f28d50b3ce6319bd92bec2cbf12f9ebc498c3f0cab53d6d28ad00
136 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of an advance-fee scam. The document body, though partially corrupted, contains references to a 'nightmare board game for sale' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to a fraudulent offer. An external URI was also extracted, pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://traffnew.ru/123?utm_term=nightmare+board+game+for+sale
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5fa5f4578cbd6.pdf
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8732379bbf6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/desenaz/juxulifen.pdf
    • https://s3.amazonaws.com/baxekojojexusol/agradecimientos_de_tesis_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/20369655-7633-421d-810a-0dd94ff37ba6/chick_fil_a_calendar_mystery_offer.pdf
    • https://s3.amazonaws.com/zoromexemuzid/love_map_game.pdf
    • https://uploads.strikinglycdn.com/files/98b6dcf5-aa69-42f8-97e9-a0b496b1712e/palajagezazijoko.pdf
    • https://s3.amazonaws.com/novifamigot/neil_young_down_by_the_river_lyrics_meaning.pdf
    • https://uploads.strikinglycdn.com/files/fac79814-8765-4598-8521-0ad7332bf485/99380961766.pdf
    • https://uploads.strikinglycdn.com/files/ca5c6c23-3afa-48d6-975e-0f1162df2ba2/2209322057.pdf
    • https://uploads.strikinglycdn.com/files/35a32da5-33f0-41ba-abc2-f0d7775b2e40/milady_chapter_25_manicuring_test_an.pdf
    • https://s3.amazonaws.com/mijedusovineti/56242934060.pdf
    • https://s3.amazonaws.com/votuweroxigezog/clone_hero_songs_spreadsheet.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_off0000ccee.bin
345b00cde1beba78dbaae0cadfe629fb506f5b9a5655cd1b2f41fed849fdf044
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 5432 bytes
font_01_sfnt_off0000df3e.bin
a6213b63b87fad025877e3ef3b3d2130d461ab87476d60477391703916fadf6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10564 bytes