Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d91a3917e24237c…

MALICIOUS

PDF

71.2 KB Created: 2021-04-23 16:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5afce9f05cf180642eff9fd1f887fd1c SHA-1: 21568416ba06bb0ab70f1dc84e3aae3c6a8b53b7 SHA-256: 4d91a3917e24237ca53e72d7a86556d74b43bee1f8bcd015dba20440023dc171
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm for SEO manipulation or to distribute malware through a large number of seemingly unrelated links.

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://lozipotod.ru/strik?utm_term=think+of+me+when+you%2527re+out+there+paramore PDF link annotation
    • http://sayseedokg.com/mepuwanitju4a.pdfIn PDF document text
    • http://vnatural.space/24277276740qvyzi.pdfIn PDF document text
    • http://blablablacar.online/kegevalrdu8k.pdfIn PDF document text
    • http://barashik.space/jiminibuzawasimivukojikiw0u3.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/41320857324.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/19835525003.pdfIn PDF document text
    • http://usacreditreport.info/pathfinder_roleplaying_game_bestiary_5rubyc.pdfIn PDF document text
    • http://risurevisawibe.iblogger.org/dodusuxajazugupolus.pdfIn PDF document text
    • http://mibamixuxonewu.22web.org/problemas_de_porcentajes_1_eso_resueltos.pdfIn PDF document text
    • http://prizinsta.site/zunepek92lyn.pdfIn PDF document text
    • http://wiinorama.fun/92083450785vfnr5.pdfIn PDF document text
    • http://believes.space/baby_boss_2_moviey3d6z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikubub.onlinewebshop.net/evenflo_symphony_dlx_all-in-one_convertible_car_seat_modesto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755f4456-6d96-4f7a-b34b-422f9aff89a8/jenn_air_refrigerators_repair.pdfIn PDF document text
    • http://sevawudefogu.rf.gd/merry_christmas_video_song_2019.pdfIn PDF document text
    • http://lizapulin.epizy.com/dejujugopapunawezudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4e0fcd-f0c0-4228-9234-9740a7696497/how_many_carbs_in_a_wendys_single_combo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0e4fcc-952f-4dee-b60c-c029ac841244/giveri.pdfIn PDF document text
    • http://furafep.onlinewebshop.net/data_analytics_tutorialspoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8bd3b7-214a-437e-a6d7-dab2f5446eeb/contact_fedex_customer_service_chat.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/george_bridgman_libros.pdfIn PDF document text
    • http://guduzexotozi.rf.gd/31420852732.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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 5172 bytes
SHA-256: 6ee7c53d0370ae4126f261613a66ca45a18fe3615d1838faf49da09a65fde32f
font_01_sfnt_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 10848 bytes
SHA-256: 5b6d102681163c6eec4294d35f44c1e07b8f123587f0238cc1a7e584faeda926

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