Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac422c6f5224060f…

MALICIOUS

PDF

78.2 KB Created: 2021-04-30 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a156be70a31dbc83fc00790ef7f2cd22 SHA-1: 2676a4d52d73078482265a49c3a0b9436a66ad9f SHA-256: ac422c6f5224060f0a4d33c5a9de349f7b3efa0435dc9ef713e33ae0a8871ea1
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with one specifically leading to 'jacksth.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', indicates a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=meaning+of+quadratic+equation+with+examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415527/normal_60016f2ce4b70.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/hwgjij4/hero_tycoon_2.pdfIn PDF document text
    • http://givikoninebana.22web.org/vijix.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/psycho_cybernetics_chapter_5_summary.pdfIn PDF document text
    • http://rufapemosisubev.22web.org/1552548109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_601c630e3ee88.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/42615094791.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/34362978082.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/popewogodimojiw.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/z2ojb56/sozejifodam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_605c4a46930b0.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jhhfhf3/directv_apple_tv_integration.pdfIn PDF document text
    • http://bajigesupin.iblogger.org/buzukemoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_5fd389a80b7f2.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/ibhdhdW/lulubonemugif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://penonas.epizy.com/dozagopijuwepitopiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78e51d6-4c6a-4f1d-9b22-70a83439a544/lg_washing_machine_top_loader_wont_drain.pdfIn PDF document text
    • http://xarugutivi.epizy.com/how_to_run_a_grief_counseling_group.pdfIn PDF document text
    • http://suxuzodezojoni.epizy.com/titugobudifazemiji.pdfIn PDF document text
    • http://peburameg.epizy.com/49731039358.pdfIn PDF document text
    • http://tipatanakuke.onlinewebshop.net/surah_yasin_al_kalam_pk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85445970-ba23-4827-8484-7e4d17a30226/how_many_calories_in_a_10_inch_margherita_pizza.pdfIn PDF document text
    • http://garapaf.epizy.com/rumimuwudojozagiruwejowa.pdfIn PDF document text
    • http://tixinova.rf.gd/what_year_does_hearts_of_iron_4_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee99c8f2-3bd5-450f-b928-6e76c3f014ad/the_places_that_scare_you_free_download.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_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 5860 bytes
SHA-256: 1d1458b4c77164e846938027f1f7e96cebe31e3c7e9e4edb9dee504f5b90cc0b
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 12296 bytes
SHA-256: 5532df910a4593971fa49078de7c0e54ebfd260d99343751a2d8dd19d85c3b73

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