Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecb6203a446a388…

MALICIOUS

PDF

77.3 KB Created: 2021-01-06 16:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 51c6d00117f014a61e27e5cf6cbb0e4a SHA-1: e305c04074736ca70582de410d38f28eef4e9d51 SHA-256: cecb6203a446a3881968e3174d0283cadb7cb14862ff712b2e22d58dc96706ef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/aws?utm_term=6th+grade+educational+worksheets PDF link annotation
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/lexofifus.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/VzbR6hf/pre_flight_briefing_example.pdfIn PDF document text
    • https://dizasufe.weebly.com/uploads/1/3/4/6/134680143/faguto.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/giy5jcS/learn_english_grammar_step_by_step_youtube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/49887149599.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/80796197369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7267dc-f670-4630-94fb-fe320a3d59fc/beckers_world_of_the_cell_9th_edition_table_of_contents.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/2387483147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8139de-3de9-467b-b718-ae014535baa2/cybertron_pc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5604000-b698-4d63-aa9d-91f480c0bfa7/masonic_and_occult_symbols_illustrated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f79f29-a8a4-44b6-b976-ef6e1a2e05ce/lelotugedubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53419362-b8a8-4bb0-9b16-aa483c9e3c67/completing_the_square_worksheet_circles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1335b309-74ee-4e37-be89-070783996ed8/20062957814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7334561a-c866-41bf-8c35-88b4f8fb3052/epic_game_launcher_resume_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/arissto_coffee_machine_user_manual.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_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 5416 bytes
SHA-256: 330b649208e3d9d9c00e497d7a868738ea2c906d79e637e2b5bc8adaccf61d13
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 11308 bytes
SHA-256: 14f7cec9ab15205cff7a81fae4b9f2922617c4a2b910808c4f2a618072050b7e

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