Malicious PDF — malware analysis report

Static analysis result for SHA-256 847678c3dc7e3743…

MALICIOUS

PDF

75.2 KB Created: 2021-02-24 21:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 34e74ea0208d4b4b6f7f065402c9a1bf SHA-1: f509c3085a49c63f2626125112b74566709acc63 SHA-256: 847678c3dc7e3743f2912dd21fec7669c3b89e79caafb94e2d0c8755ca398fe0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of a malicious redirector is a high-confidence indicator of a phishing or malicious content delivery attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=doctor+of+philosophy+in+public+health+unisa In PDF document text
    • http://flash-sar.online/rosemarys_baby_1968_streaming_ita22php.pdfIn PDF document text
    • http://biotringel.shop/83539368931xq91c.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/7FSyhf6/ward_consolidated_theatres_showtimes.pdfIn PDF document text
    • https://cdn.sqhk.co/pobefozo/h1CGV2D/spiralizer_zucchini_recipe_side_dish.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/excel_vba_function_call_on_left-hand_side_of_assignment.pdfIn PDF document text
    • http://osmosiotzs.fun/percy_jackson_sea_of_monsters_book_setting2bovo.pdfIn PDF document text
    • http://oneshops.space/gafoxagesuwiwakepakunosegmrksm.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/u2sjchf/ski_safari_2_game_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/0TI6gf7/reliance_jio_recharge_customer_care_number.pdfIn PDF document text
    • http://italy50wow.pro/71353223900kd3o2.pdfIn PDF document text
    • http://olx-delivery.cc/cho_gath_guide_s9ms3tw.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/9zhcNKk/60616965310.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/shark_ion_robot_vacuum_r75_with_wi-fi_rv750_reviews.pdfIn PDF document text
    • http://yarrebitteh.online/cheap_wedding_cake_bakery_near_mebnwtg.pdfIn PDF document text
    • http://design-kvartira.info/11046830205hwxb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafepugi.rf.gd/now_is_the_winter_of_our_discontent_meaning_today.pdfIn PDF document text
    • http://xofududegotu.epizy.com/ardmore_oklahoma_weather_report.pdfIn PDF document text
    • http://mowumaja.epizy.com/45512538903.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/74429756908.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/torewadefewamit.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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 5344 bytes
SHA-256: 00887fdc711e232cff7a22d7df20cf91a938658b96b46dbced9d9817a66d9b37
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 11016 bytes
SHA-256: fbcf8600f72d10d347b856e3d520c54f0aa9ff289923f2417a8d4c7df3febf03

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