Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffc8de40bee5e07…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 18:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0136cf5532fc5fbe29668d1f1b3f8f58 SHA-1: 9a41fe7d2aac7a80543963c7b4e2e447a94df67a SHA-256: 3ffc8de40bee5e07acad1de79da1a95a3469f25bbb51e45a29626d762b8c4001
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous external URIs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution scheme. The primary attack vector appears to be social engineering via a deceptive document title, likely leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/award?keyword=abolition+of+article+370+pdf PDF link annotation
    • https://cdn.sqhk.co/xepiriza/mhgjCjf/niwadana.pdfIn PDF document text
    • http://fly-drive.online/38113285937322sx.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/dihjchb/buwepozesuneranupowewog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fe978f90bddf.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/ijlhaha/video_live_wallpaper_samsung_s10.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/gfY6jfc/27699676087.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/d4kIBdS/fuwis.pdfIn PDF document text
    • http://idealslim-ordina.site/glencoe_history_book_answers39ga8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5ff9c662e616e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5ff47b0abd405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_60110b15a98a4.pdfIn PDF document text
    • http://itchia.space/figure_drawing_for_fashion_designs5xq6.pdfIn PDF document text
    • http://nncucuucuc.space/bertrand_meyer_bookeijpt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5ffff7b92c7c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5feb78016c9e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_60447362b6914.pdfIn PDF document text
    • http://maykistore.ru/what_are_the_seven_rivers_in_africa8dbhb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403818/normal_5ffba036d4563.pdfIn PDF document text
    • http://prizinsta.site/english_vocabulary_list_with_pictures1hjxx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_605020897ca11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_601dfbe8f297e.pdfIn PDF document text
    • http://blancer.xyz/bring_into_existence_crossword_answersiu8r5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 5484 bytes
SHA-256: d7a88259568c9bdb8500aa26b914f2d53b8d85f6df8b9ad0a3eba17b4e0f192a
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 11388 bytes
SHA-256: 6fcc81f563289b5db34ed25032df3abb7ad3a5cb08d6afa96c66bd733fbaf944

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