Malicious PDF — malware analysis report

Static analysis result for SHA-256 5777b4f5cb1a0d1d…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 06:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3782a5c2b0588054e01c232b4d55eb86 SHA-1: 4a5166d0ab4a8a742c2177dcb4b241a10782b93f SHA-256: 5777b4f5cb1a0d1da68b5f289e39846764f9e8f9f6981ce987e0aac09216e2bc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://ponafet.ru/wix?keyword=gizmo+worksheet+answers PDF link annotation
    • http://help-feedback-amzn6.xyz/java_string_format_long_numbera5gt6.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/princess_diaries_book_8.pdfIn PDF document text
    • http://cleanup-sale.site/autocad_app_for_androidgf7rv.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/tovizemejofifunoxad.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/20433043818.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/ramipadadefenure.pdfIn PDF document text
    • http://betmoy57.com/jigogodisojadq0dwm.pdfIn PDF document text
    • http://armlur.space/tusozogulvb8w.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/KjcOCeS/5920139220.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/gjjcUhg/fotawesumusunomaguserol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawokale.myartsonline.com/13315263134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9955c75-a36e-416d-a75f-280aea1869a4/bumiluraxumekako.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/vunakotokamepatagib.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/cpt_11042_icd_10.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_aa1ccbe7f9214ed38f9c8ce0fec58ee2.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_a3810f8794fe4744aa1384fc9b1e9d7b.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_3ba4ff76db064aeba2f282b40e44b4e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d737521-f97c-4d41-b014-32c7b2c17dc4/vogoxopef.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/c_advanced_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b45fab-baa3-432c-9bc2-0c72814d918e/gemtech_outback_iid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372dd308-07fd-48ef-9edc-53c3f78bfe57/how_to_pair_big_blue_speaker.pdfIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_12a65216f6204b86bb698e042c6b4b07.pdf?index=trueIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/d-link_dir-890l_ac3200_router.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 5132 bytes
SHA-256: 88f1d2afa089a9bbb68fb920ef033485d5c3a2deff9bbc5c7edda16c45872937
font_02_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 10336 bytes
SHA-256: f5180dcbde153a67a7bb7ec8079d703daa18f9dff54e0f727c4aa0e17f27d18f