Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6789c65752e4e0…

MALICIOUS

PDF

85.5 KB Created: 2021-03-12 21:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6075195a0a9d07c0e1041e1ae3c07adb SHA-1: 9ac55fd3355d68f180679fc7dfd8775b45b07643 SHA-256: ad6789c65752e4e0bc776abc06fab9057ed6f714d1b49355c884e3bd48ad5446
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to these external resources, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=blueprints+psychiatry+6th+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ffd1ea552b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_602e316a23f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hZgd0hf/pumpkin_painting_ideas_2018_scary.pdfIn PDF document text
    • https://modagifamu.weebly.com/uploads/1/3/5/3/135341464/lusesisuguvuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_603191ac67f82.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/hiichJT/roads_of_rome_2_download_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/giQmtaq/top_10_free_kick_takers_fifa_21.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/egd2ifQ/kilet.pdfIn PDF document text
    • http://sefabesegasedan.22web.org/mexuki.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/dheGjhT/kikekizagele.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/gwxhay7/28421314554.pdfIn PDF document text
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/304558.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/gchb0jb/4983592990.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/ximupuv/aquarium_game_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/its_not_how_good_you_are_its_how_good_you_want_to_be_summary.pdfIn PDF document text
    • http://kinefinukabel.epizy.com/nineniw.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/good_bookshelf_speakers_for_home_theater.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/incoming_call_flash_light_app_free.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_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 5640 bytes
SHA-256: d3ce23fd3f20cc7e3771237cb1cc99c656d08b722d65b84d5d0c175b652f3332
font_01_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 11856 bytes
SHA-256: 4433052fe5869087641288b7fe568a91e8e87fcc3cda162a439a6ea053c5a2e9

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