Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf6f2e1a4c33b9a…

MALICIOUS

PDF

112.9 KB Created: 2021-02-22 01:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f2b6b3f3e4465f62133b97a6884acaf SHA-1: 3f2f3fdaae7e2a75ed9fe1247b8856a9e607f811 SHA-256: 9cf6f2e1a4c33b9af392dc6a36053533f959227696953cc11de1d64870f590c1
126 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to direct users to potentially harmful content.

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
  • 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://baarspo.ru/aws?utm_term=the+lion+the+witch+and+the+wardrobe+movie+synopsis PDF link annotation
    • http://larts.digital/video_editor_software_for_android_mobileyx5hl.pdfIn PDF document text
    • http://itravelgr.com/78371993326fzcxx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5ff56b9d72917.pdfIn PDF document text
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/2245959.pdfIn PDF document text
    • http://koprovk.xyz/little_black_boy_haircuts_with_designs5s72u.pdfIn PDF document text
    • https://cdn.sqhk.co/tubadaluzafu/g4WhChi/doomsday_heist_glitch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_602f362f08435.pdfIn PDF document text
    • https://cdn.sqhk.co/fanekizesedi/ihhdufT/ground_operations_development.pdfIn PDF document text
    • http://itali-big.space/canon_printer_service_tool_3._41bbvk.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/SicQggi/coupons_for_family_dollar_smart_coupon_phone_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5fe947caa5e90.pdfIn PDF document text
    • http://zalavsky.ru/man_of_the_house_cheatiooqx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459176/normal_5fcb4af8aaf22.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/jiwebixisok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/figidireki/bubble_shooter_sea_saga.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/aayegi_aayegi_aayegi_ringtone.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D21 5656 bytes
SHA-256: 63430095e340f39fc0a2bcabc96b6e88808d03cefadab4e76b95456fc8cd5841
font_01_sfnt_off00018043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18043 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00018ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BA6 12416 bytes
SHA-256: 76d1fc0cfe1a24a7bc7383e28a02d7c5697b01e9e5f876e7ef63fd2ec8741b33

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