Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f5863718fca5b8…

MALICIOUS

PDF

74.4 KB Created: 2021-03-01 19:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 591d887403e90350813a43f324340b06 SHA-1: e2e4561a15fe80f123a37b891555f7006661861c SHA-256: 15f5863718fca5b8a650f7a07a87fc1604b99c9bba43b6acead8b86ba809253f
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the PDF structure suggest it's designed to lead users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://mezovuduw.ru/strik?utm_term=how+to+write+an+essay+for+6th+graders PDF link annotation
    • https://cdn.sqhk.co/kinubowa/dliehg7/49271476904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fc5c05866cd0.pdfIn PDF document text
    • http://lngcliente.com/268588410030tg84.pdfIn PDF document text
    • http://opencabinets.xyz/kitchenaid_food_processor_attachment_with_dicing_kit_reviewlccwk.pdfIn PDF document text
    • http://zakukat.iblogger.org/android_app_emulator_for_windows_10.pdfIn PDF document text
    • http://sanamikegimelab.22web.org/nogojujusofukudodiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/hfY7Yid/play_lite_youtube_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/f3hgGSR/97813799199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_6008236f39ae0.pdfIn PDF document text
    • http://epipog.com/year_10_english_worksheets_freeac11n.pdfIn PDF document text
    • http://hempmap.ru/defiant_motion_security_led_light_home_depoth8p4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_603c576d8c903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisipusizen.rf.gd/hills_canine_i_d_stew_feeding_guide.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_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 5448 bytes
SHA-256: 71ca65af53ed0748c3324c241689ecb9c75eea9c65c276f3c30f11ccdc9e77fc
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10280 bytes
SHA-256: f06df979a802125c4990b91b9bc43064462aa7bd769e6429e19927a762e497a3

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