Malicious PDF — malware analysis report

Static analysis result for SHA-256 9649200e190b4a8e…

MALICIOUS

PDF

79.8 KB Created: 2021-03-09 12:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4fca4afe1e35cc558d1dc09f6f1dc7cf SHA-1: 926548ae1687ab5fca6aeedd94d61683f49c097e SHA-256: 9649200e190b4a8eb3c9aa1692d79632fd8c94a3c9d1aeadf42e0f31bd1cba08
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various PDF documents, masquerading as learning resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF structure suggest an attempt to generate traffic and potentially distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/award?keyword=6+claves+para+aprender+ingl%25C3%25A9s+pdf+free+download PDF link annotation
    • http://kazexezawulozij.mypressonline.com/89193296540.pdfIn PDF document text
    • http://wufamega.scienceontheweb.net/ti_nspire_cas_solve_for_x.pdfIn PDF document text
    • http://ziziwujavoj.iblogger.org/the_subtle_knife_audiobook.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/24_laws_of_seduction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_600e5559de3f0.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/transformational_leadership_in_nursing_journal_articles.pdfIn PDF document text
    • http://kozovuxe.22web.org/xojobunavumisorezuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_6031d97ce88f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_72af9018fecf440292e40b32cecfb4df.pdf?index=trueIn PDF document text
    • http://vosoximulitit.rf.gd/pegudeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a5f3ca-c29d-4174-bdf7-4bf63349ae61/blackbird_tab_baritone_ukulele.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_1102024eb1f0473ca19730db24569df9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ead020f-b152-4555-8761-fbbad0b28b76/japejatenuwepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a376a7a-8162-40d1-97f1-2f90f104bb05/ruwejuporijefegew.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_8c0896ad8e02480f8e8bbe7084af8cb0.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_5fc4801b07e24ed8bf2bdd80af729bdb.pdf?index=trueIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/altered_carbon_season_2_episode_1_reddit.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_a1a5a299ec8e4f5c891e050d42116a43.pdf?index=trueIn PDF document text
    • http://tunawibiga.rf.gd/74147118191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f398675-3377-4ec6-8536-9d7a3dc291f6/danny_and_the_deep_blue_sea_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b70c29-d097-4770-9922-7d14b1d201a9/22390517079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41201e52-4f4b-4ffa-b357-c99d7627a009/kuvolulobese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f46219-2ed8-4dde-9293-07a5120343e9/how_to_make_a_book_jacket_out_of_paper.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_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 5676 bytes
SHA-256: 036f5f5f578ec13e56a9a14d15625506dd5f51fd60280414aed4b0ec787a452c
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 12864 bytes
SHA-256: a95dc63b5e346984e2f1a98054f80a526a14c736528aca5e38d26b59a0f61b5d