Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b6b9c2466380a5…

MALICIOUS

PDF

66.4 KB Created: 2021-03-08 10:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d30a731c6a3e0e74c5dc7fcedc4409a4 SHA-1: e06f3021c8012bb57712cdd04a108670c0814fdb SHA-256: 78b6b9c2466380a563969302128c9026b173ccbdd2b95a60833cdcc442d1c588
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=strikeforce+kitty+last+stand+unblocked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5fed55ef89f28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5ff1866c3942b.pdfIn PDF document text
    • http://getyourcredit.info/11368023136a8fu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_601f3771be21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_603862cff389b.pdfIn PDF document text
    • http://becloud.website/39797150005tn6nz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_5fd3874c380bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6043472b46be2.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/how_to_make_the_best_paper_plane_with_a4_paper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385004/normal_60085ab3af45c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_5ffb545236a3b.pdfIn PDF document text
    • http://nelilovodik.scienceontheweb.net/mvc_interview_questions_for_5_years_experienced.pdfIn PDF document text
    • http://teksalon.xyz/how_to_reset_swann_4980_dvr_to_factory_defaultqa1xg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fe9a7d66c355.pdfIn PDF document text
    • http://lorenbayi.com/mac_os_keyboard_shortcuts_for_windows_users83cnl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff1b25c26216.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/48494974061.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/29975514417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_99a87575d5994cb9918626046de9a1f4.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_f1fa1d96d3084d32ac5c5d761ec8dc45.pdf?index=trueIn PDF document text
    • http://tuwutexo.onlinewebshop.net/how_do_you_spell_ugly_in_french.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_7d631e4287ed4285a3cd0ecae158b770.pdf?index=trueIn 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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 5424 bytes
SHA-256: 15ab58c6c49c7a784047a39ff40814fe1009d5d0815b79a60e961ba0dff24b2f
font_01_sfnt_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 10080 bytes
SHA-256: e0330ece6711d2694505139096f40efe919bb5157c363d3e459400bb0f572417

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