Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b2a780bcc1cecd…

MALICIOUS

PDF

78.1 KB Created: 2021-02-26 12:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb4ef1cf68cea8ebccb46284e78ab64b SHA-1: 1bdc3828b557a8d0286c27aae8801f9c54e16c33 SHA-256: c6b2a780bcc1cecdb2a39152ff59849f85e72d23151eb7479a8acd3b4c5eefed
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm and contains malicious content, likely to distribute further payloads or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=apush+period+5+test+answers In PDF document text
    • https://kawikesidalebel.weebly.com/uploads/1/3/4/6/134649090/zivotidusa.pdfIn PDF document text
    • https://cdn.sqhk.co/jokutevek/SOQM7N9/planet_child_families.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/iigerje/asteroid_belt_name_etymology.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/eyjajdV/diversion_definition_oxford_english_dictionary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5ffaa178282a3.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/eSigKhe/rebaxuxojutusakadarobo.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/elgfjeG/badabizume.pdfIn PDF document text
    • http://moviesaddaa.online/kabbalah_mashiah_librosk5jyu.pdfIn PDF document text
    • https://zajoralesame.weebly.com/uploads/1/3/0/9/130969459/1865404.pdfIn PDF document text
    • http://znasila.ru/android_terminal_emulator_root_permission_denied2fxgp.pdfIn PDF document text
    • https://cdn.sqhk.co/kofisosiz/gtNCvk6/6762291968.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/pubopelej/caracteristicas_del_imperio_carolingio.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/box_culvert_design_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/cost_revenue_and_profit_maximization_guided_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/32797673373.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 5220 bytes
SHA-256: 9b98af7a721bdcd1ba612485fbe9c1a1810dee355a4d25a72ca9b10eef2b5a14
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 2568 bytes
SHA-256: 5c7b186e725617c75b8fbf309a7bff29a92506dbea0dbe25db1ee8f5438a3ec6
font_02_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 10712 bytes
SHA-256: 17282db66f73526a8242a7e1b451d6bd954611bbca8d3fdb15cde8295f44d6c0

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