Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfe57940cc26355…

MALICIOUS

PDF

82.5 KB Created: 2021-03-25 16:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 419e5bc4edc0152f8e543fa1371264f3 SHA-1: 69183cb835f5d4fe96f855dcdf35ac01cc0cffa7 SHA-256: cbfe57940cc26355b7e770abc6bb80aeedc582b97c4d17371096cc37ca8bff04
186 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 0.9996

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://fokemale.ru/123?utm_term=cover+letter+for+a+report+sample PDF link annotation
    • http://bawagel.22web.org/quantitative_versus_qualitative_research_in_nursing.pdfIn PDF document text
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/8567066.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/rutison.pdfIn PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/xagekasogesep_vokawid.pdfIn PDF document text
    • http://bepegut.iblogger.org/the_merchant_of_venice_quotes_antonio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e8b6b0-1f21-4342-ba51-bab2945461f1/rock_cycle_worksheet_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/android_tv_os_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad74648b-51b0-4a50-beaf-03b99233872f/wheel_of_time_book_12_read_online.pdfIn PDF document text
    • http://sazuronami.epizy.com/wizivuloretaje.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/tativ.pdfIn PDF document text
    • http://warodisomadux.epizy.com/similar_triangles_worksheet_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23f54ae-ed32-4872-a8d0-55e486e03ea8/how_to_turn_on_philips_gogear_vibe_4gb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343e23f9-6ce9-41c2-8b45-0b42aaa25002/45671143382.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/87294061993.pdfIn PDF document text
    • http://vubejipolav.epizy.com/58762226179.pdfIn PDF document text
    • http://sokagozu.rf.gd/activate_windows_10_pro_for_free_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/south_florida_inshore_fishing_report.pdfIn PDF document text
    • http://duvubatas.rf.gd/33803819868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e744e93e-1f83-4d36-a5c0-8c523237acaa/59023719904.pdfIn PDF document text
    • http://subejev.rf.gd/rinunoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3279d35-e022-47cc-bb9c-3f86db628081/rogumudisiratejaxexi.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/is_a_w_on_your_transcript_bad.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_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 5012 bytes
SHA-256: 4284d8eeba119507818da73975b4bcf647085e6a6886233afb68f782127460e4
font_01_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 10776 bytes
SHA-256: b5b94dd7c6abcba6d956efd16baa1dea75d830684f84c7de0c7e5a5a17c9dd13

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