Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d4ccfaf654df9c…

MALICIOUS

PDF

81.1 KB Created: 2021-03-30 00:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 84c749dcf9de242abc838a2c82ec298f SHA-1: c1ad908a8f1d420e911fbf63c7bfd75a37209e18 SHA-256: 13d4ccfaf654df9cb0de1a79d50682168bdf19b7d3a3f4671486370cee982668
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for information. The embedded URL 'https://fokemale.ru/award?keyword=credo+cat%25C3%25B3lico+portugues+pdf' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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/award?keyword=credo+cat%25C3%25B3lico+portugues+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370268/normal_5fde497c0b73b.pdfIn PDF document text
    • http://aov.one/fipufusaziwamatef31dfw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_604494120b03e.pdfIn PDF document text
    • http://medway24.com/muvisagenolojgitc.pdfIn PDF document text
    • http://trydouche.xyz/ib_chemistry_textbook_2015l69ph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5fdb63e972b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5feaf782c7ba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407087/normal_6004c34f8e715.pdfIn PDF document text
    • http://leftoutclub.com/906737020736dtu0.pdfIn PDF document text
    • http://goldotzyv.ru/zudubaxowexed8lsy.pdfIn PDF document text
    • http://vedice.ru/vamolavapeuayii.pdfIn PDF document text
    • http://paksorond.xyz/passport_9500ix_update8m1i5.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/ec8f766e-ed35-4e70-b777-1b03613652ec/tusadupemum.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/difumexikosalefijesiroti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a545594a-fbd3-47b7-b4e6-0fc3b0f9912f/fitbit_charge_hr_3_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/how_fast_is_a_dodge_charger_v6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c4b11b-cd4a-4bc1-9817-dd548e2120aa/pexure.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/inkscape_svg_font_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5907bbab-7b48-4bf1-bd4c-ac9b87806235/nugudukodogutosugarekimex.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/messenger_for_iphone_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4954cc-1344-4845-9d69-1699f49add79/60358353414.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/wisifonazuginiletisi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 5364 bytes
SHA-256: 0d350b76b96c0d7e3e9ff053b82e77181a2fb7f6702579d44c8a1b577897dc81
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 13152 bytes
SHA-256: 2ae41eaa401cb9ad2e9bc206a264817da8eb1d9ab34903e52d8bfb57440bf82a
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e