Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c41c3f3351b16eb…

MALICIOUS

PDF

74.4 KB Created: 2021-02-17 16:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 444cc614335704787efd7190e74e83b4 SHA-1: b4664eab88ebd0e82ad75cd5b81ad697a2c5f435 SHA-256: 9c41c3f3351b16ebc1b304e09422b6944e654be410ea6310e38a05b4db2e7fca
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=life%20your%20life%20meaning PDF link annotation
    • https://cdn.sqhk.co/ranuvore/Zkkjgib/59829148327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_5fed5e69da77c.pdfIn PDF document text
    • http://discout.online/aisi_420c_datasheetdgq74.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/figijhe/fifa_soccer_13_3ds.pdfIn PDF document text
    • https://telemoradez.weebly.com/uploads/1/3/1/0/131069753/masegirofivado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_5fd97f8c3ad0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_602a3a35ecb8d.pdfIn PDF document text
    • http://pedrons.space/chaar_sahibzaade_2_full_movie726sf.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/refexozinoti.pdfIn PDF document text
    • https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/5777366.pdfIn PDF document text
    • https://cdn.sqhk.co/nenutipu/hbCfUie/double_dragon_4_switch_cheats.pdfIn PDF document text
    • http://astrohelp.space/fiat_panda_workshop_manual_free_downloadg23o4.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/baxegezivumi/89164437379.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/96924602885.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/xemebaweranapanikexukubiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/bobol_wifi_mikrotik_dengan_android_tanpa_root.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 4952 bytes
SHA-256: 7fb1ceccdf4be135395c3c298a71d9e7118859a78292c29ed8e018c71e8212f6
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 10504 bytes
SHA-256: e80e7a2614c78de44dbbe2c07efba293a43053722d621828b34c4ddbca06c844

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