Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de27f1b33532c1a…

MALICIOUS

PDF

78.0 KB Created: 2021-01-17 14:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 67fc3a6ca481066c01b3c5755b87e5a2 SHA-1: 713bdb6b7563aae61f50c473cf47d5237dba1cd8 SHA-256: 6de27f1b33532c1ad715f3bb8371e79401ade58a7dd1466542cafea7a4f1669e
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The file appears to be part of a link farm hosted on disposable domains, likely intended to lure users to malicious or phishing content.

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 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.
  • 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://ggtraff.ru/aws?utm_term=free+bubble+blaster+game In PDF document text
    • https://site-1177111.mozfiles.com/files/1177111/26125310799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_5fba8d2b219ee.pdfIn PDF document text
    • https://site-1178096.mozfiles.com/files/1178096/novel_outline_template_google_docs.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/ig4hbTK/download_game_swordman_reforged_mod.pdfIn PDF document text
    • https://site-1187487.mozfiles.com/files/1187487/does_he_like_me_back_quiz_buzzfeed.pdfIn PDF document text
    • https://site-1175130.mozfiles.com/files/1175130/durga_saptashati_marathi_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470537/normal_5fd7d22ea29ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5f99145b9ca55.pdfIn PDF document text
    • https://site-1168375.mozfiles.com/files/1168375/87127911406.pdfIn PDF document text
    • https://site-1177793.mozfiles.com/files/1177793/que_es_uniform_en_ingles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5fa2e3ff4c986.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/gBgihbN/10003033605.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/27578493880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5f9780eed5c4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 5100 bytes
SHA-256: 8d7b386623a341c6f91f0f13d439bea02b44610425f9dac917776a8e93c4a37c
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 10844 bytes
SHA-256: 0d1b5d35000c35f6942eaec4f4ee6ac78e3eeac264484cbe3a180c2a1c76bdf5

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