Malicious PDF — malware analysis report

Static analysis result for SHA-256 43432388ec48cb16…

MALICIOUS

PDF

73.7 KB Created: 2021-05-04 03:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bee553802093251bab538798a819da40 SHA-1: 5d93fc798c5ba7d5a7db170b68596b69cc35efb9 SHA-256: 43432388ec48cb16f867ea174ea0e929172e22ce2d72fd18a57101f1655446c2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=metric+conversion+ladder+method+worksheet+answers PDF link annotation
    • http://rokukugopo.22web.org/what_is_the_political_economy_of_japan.pdfIn PDF document text
    • http://datab.vip/tunuwapimawuburorvffvc.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/ZowBhaW/steelers_news_triblive.pdfIn PDF document text
    • http://pobijubak.iblogger.org/bloom_s_taxonomy_domains.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://leadtop.co/780597212429i606.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/ijXlrib/rilapip.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/hgnh4EX/kartrider_rush_for_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retipike.rf.gd/how_to_calculate_resolution_of_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c75bce9f-cb9a-4b1b-a8a1-16a9f4ac1620/3_cycle_semi_log_graph_paper_download.pdfIn PDF document text
    • http://dojeranorered.epizy.com/nejavikew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3b522f-7a14-4ae7-b422-cc2b4f5b5816/u-he_tyrell_n6_review.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_5a66a6a6f45e40608eb4756c5a8dd4f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48fce3b-d303-478b-9415-0614b1079cdf/why_is_phillips_curve_downward_sloping.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_1b0e93bf524c45599a296a438f4e3328.pdf?index=trueIn PDF document text
    • http://pevuzimoba.rf.gd/24946756491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b645fcf-14b3-4a3f-9870-7220ac27b60b/flight_of_the_bumblebee_flute_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d103e9-96a3-4407-92f8-1c0f132f9619/46102324257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65dc0260-15f8-4cbc-b77a-bc6bd456ca5c/99883981270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78439943-2884-465f-87ef-5d8a8a1f1d3d/alcatel_3025x_mobile_phone_manual.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_b6e21e0b19094204937b7fe13ad89d12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5258602d-8dc6-4be5-92ca-f5da2bf46261/what_do_you_understand_by_cultural_tourism.pdfIn PDF document text
    • https://1437f3f1-f978-4e1b-9120-555090070881.filesusr.com/ugd/d4ef56_3b91916431204054a66d127aea511498.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87359794-54dc-4192-98cf-e9ea3b016fea/45069640484.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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 5400 bytes
SHA-256: ca40acfdd4137b1e643dc7b69fa99a97c61f117bbd4538fb5ac5897c395d5f1d
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10444 bytes
SHA-256: 9714b9a57f57d19f82f27ab8806560bd1caf6e035df8f6adf216148566cb8ae3