Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e43d6c0cc811b25…

MALICIOUS

PDF

89.1 KB Created: 2020-12-27 08:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d97f40c4bda457451861f4f11e5c4fdb SHA-1: e9652be79b8e7bf68d3df9c1a10a2bfa83c7cee7 SHA-256: 4e43d6c0cc811b25c4c9c89d64c64b2a233b18798a46df89679acae62536aa83
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a phishing lure related to Christmas delivery slots. The ML classifier and ClamAV also flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?utm_term=christmas+shopping+delivery+slots+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fb564475a2c3.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/gfigLEB/citadels_medieval_war_strategy_with_pvp_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5fc3f1e6bbfe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408711/normal_5fc3de5413338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fd68b7cde0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_5fb74599b1c54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fa3f04d5fdc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5fa07a17b97ef.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/9hadgim/strike_fortress_box_mod_apk_new_version.pdfIn PDF document text
    • https://mapokelamoda.weebly.com/uploads/1/3/1/8/131856574/kuvirasira.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/bipepezuwed/zuwuzig.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/sheet_street_baby_blankets.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/kagapuxaruvitosizexuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/xexafakinopok.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/vikefewabowemo.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/bejeweled_free_online_games_no.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/softball_uniforms_builder.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_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 5716 bytes
SHA-256: abcdebca7b1b08010161217b64fbc4c5e4f7bfe5c54fe69678520505fede2e1a
font_01_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 11292 bytes
SHA-256: ace64e051146f98c87fa704a5cf05c19430464adfe9b03507af71a29ed6499b2
font_02_sfnt_off0001415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415C 16208 bytes
SHA-256: 3b60b84f554398af14c4ebb484939287515345ca9e6929e6e2fbb436f7be1588

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