Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8b09e76104404…

MALICIOUS

PDF

84.6 KB Created: 2021-01-15 06:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4cd937b2ba88e4de86a4450aa8a7d2d8 SHA-1: 23544052f711ae3372a81120c1fcf2c15db8d1f5 SHA-256: 72a8b09e761044040cd3b8869980c95db9c693401a1694fa31701b47101b447d
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Android for PC', likely a pretext to drive users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8405

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.
  • 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.
  • 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/aws?utm_term=android++for+pc In PDF document text
    • https://cdn.sqhk.co/matelasoguje/Veij5hi/winner_soccer_evolution_elite_apk.pdfIn PDF document text
    • https://site-1208026.mozfiles.com/files/1208026/airmen_mock_test.pdfIn PDF document text
    • https://site-1185125.mozfiles.com/files/1185125/kegirexaruvebakilemax.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/savowu.pdfIn PDF document text
    • https://site-1177018.mozfiles.com/files/1177018/bivitufi.pdfIn PDF document text
    • https://site-1244934.mozfiles.com/files/1244934/bmw_x3_m40i_performance_upgrades.pdfIn PDF document text
    • https://site-1171753.mozfiles.com/files/1171753/vikings_war_of_clans_defense_strategy.pdfIn PDF document text
    • https://site-1178567.mozfiles.com/files/1178567/cyber_hunter_game_engine.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/sad_breakup_image.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421201/normal_5fe4e86b87c03.pdfIn PDF document text
    • https://site-1177796.mozfiles.com/files/1177796/cinquain_poem_templates.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/bisute/family_budget_excel_template_free.pdfIn 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_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 13344 bytes
SHA-256: 0ee34f99f5c68e09af888db9e607049cd3e21e37d7bbe561f8f505311402673c
font_01_sfnt_off000138db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DB 4716 bytes
SHA-256: 1a9ac889d17588c465bbf8025057131111187d4b18784406074b378a37f1e435

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