Malicious PDF — malware analysis report

Static analysis result for SHA-256 db99ec4181c8b266…

MALICIOUS

PDF

80.8 KB Created: 2021-03-18 15:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ea91498961476054933c06ef624b81bf SHA-1: 25f18ccafdf2017fb016877fd0802b3cb0a22e6d SHA-256: db99ec4181c8b26695b4df4b84105a96ef3738be9c8134734cec327eafffabe6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination by using multiple redirecting domains. The presence of external URIs suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=hiding+place+pdf PDF link annotation
    • http://pearhaidhr.fun/jinja_load_templateoqs4r.pdfIn PDF document text
    • http://fapuditutatinu.iblogger.org/how_much_pollution_does_the_us_military_produce.pdfIn PDF document text
    • http://nesobaka3.xyz/supergrass_alright_piano_sheet_music8txy4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_6044df40715c5.pdfIn PDF document text
    • http://urolog.xyz/how_to_set_time_on_american_hunter_feeder0o5q9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_60026d39c6570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_604a26fe15153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_6000b043c12d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_60331e078ce27.pdfIn PDF document text
    • http://visanekis.iblogger.org/show_me_what_a_cashiers_check_looks_like.pdfIn PDF document text
    • http://spoonnumberone.xyz/nkjv_bible_filetzpej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zamonile.epizy.com/tamil_story_books_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/what_is_the_correct_order_of_the_plot_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/55460264988.pdfIn PDF document text
    • http://josodajudiwabo.epizy.com/pumaj.pdfIn PDF document text
    • http://telomilabevi.epizy.com/garageband_to_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/how_to_construct_a_velocity_vs_time_graph.pdfIn PDF document text
    • http://zezazemana.epizy.com/best_cryptocurrency_trading_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452bebf3-ddf6-4693-b12a-e3a364a98dd4/nets_of_3d_shapes_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/call_another_activity_android_kotlin.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/blessing_of_bapu_mp4_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342866fc-f002-48ed-8f63-cd46d8ba030e/what_do_light_bulb_symbols_mean.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 4608 bytes
SHA-256: f2dfbae66de5fadaa68ef923dc403591b1e7fe053a5dbd109ca43d10ab40af06
font_01_sfnt_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 10932 bytes
SHA-256: 2c0b951091d81024588acd1225c7e37ce142a7d7853de4d4f6b8749b1d3ac354
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3