Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1be9d9b331b6fa0…

MALICIOUS

PDF

94.9 KB Created: 2021-03-16 20:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: eaf91759925aaa6ee834127dbf04a44b SHA-1: ff2b8f25e06886d3eabb7ff38fa800952979de82 SHA-256: b1be9d9b331b6fa0becfa67e80d40a1e7b8d48b4b456ab8b451d40fa81a8cef1
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, with one prominent URL identified as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/award?keyword=caperucita+roja+hermanos+grimm+original+pdf PDF link annotation
    • http://ericksandoval.com/42789507845c1qtw.pdfIn PDF document text
    • http://sugoxebojun.getenjoyment.net/kilexibopamej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_6033c7055e34c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454562/normal_5fe471410f34f.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/eastman_lake_madera_ca_fishing_reportj94w3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_602eb67c80362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_604adec0ecda9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ff05c129a968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408991/normal_603ffa3eab540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff10476b9ce4.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/3549442124o7bon.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/614947bc-5935-4056-bb3a-fbcbe57d9fb8/tp_link_n750_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b00ed4-a53a-47b9-b245-1729e576650a/interactive_charting_outcomes_of_the_match.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_92e7a246c9704721ae813dcbaaad5bd3.pdf?index=trueIn PDF document text
    • http://zepuwiz.atwebpages.com/gradeup_banking_and_financial_awareness.pdfIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_0708892b2aa44429b0ad2f7b9f8051bd.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_cf2a3239745e4153a9a0896061c56e5d.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_8bbdba70955048c38f54f7c52bf44132.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b9be03-3d99-4539-92fd-e2921344e40a/53378610460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef2e2a7-58af-40dd-90df-b770b827db22/nokukubekapivoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8355e03f-1c2b-46b7-a3ee-7fef6cc69fdf/how_to_write_an_introduction_about_a_poem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 5548 bytes
SHA-256: a8d7f7476b5269b5f67ebdf64346698e8254f7d21c8a4beec7a53b45352b53df
font_01_sfnt_off00012656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 1776 bytes
SHA-256: da4bdfe8f63cecd4601b5b66da62536f2e72c140b513a5833caa66835378bcff
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 12188 bytes
SHA-256: 600c275b1095ef25f8dcc0972cb40657943684849b031d2cb0e2752c08f3001a
font_03_sfnt_off00015718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15718 16372 bytes
SHA-256: 99f2b01273d3d60a519a4c94b04a23294981ed26542852d4711254b1f936f239