Malicious PDF — malware analysis report

Static analysis result for SHA-256 415a1d14e4b96c49…

MALICIOUS

PDF

82.1 KB Created: 2021-04-21 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f87374d8b6fc098ad1aeba9ecef5c239 SHA-1: e7856a13ff103a2bd4cf14ad53da4f72f4255c9d SHA-256: 415a1d14e4b96c49c3244e078f209839271384ab2f50f20b7966855299c18ffd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to 'kuzutuzo.ru/strik', suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

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
  • 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://kuzutuzo.ru/strik?utm_term=mbti+test+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450509/normal_6023d83f5e7b0.pdfIn PDF document text
    • http://larts.digital/838951253150ynyv.pdfIn PDF document text
    • http://leaninrzpd.site/gizezeveduludyojfm.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/SijGjew/kesoko.pdfIn PDF document text
    • http://retys.space/114904990830ae04.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/Wijhh5v/pexapejatujibofa.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/97532914061.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/bijavewakalij.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/zijafisofefulizotesox.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/sozaxow.pdfIn PDF document text
    • http://899themes-demo.ru/55540981494s7fxg.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/aircraft_maintenance_engineering_salary_per_month_in_india.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_6045bb913efb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_e9f99df42f184036a0e72f4b22e206ac.pdf?index=trueIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/barrett_formula.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_c24cb36be0554e24801ab17658e8eac1.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_9f477018d66a4506a41974adb2cc1a44.pdf?index=trueIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_e33eeb05747f40a6a3ef033d76ba7c5e.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/how_to_change_fios_channel_without_remote.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_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 5020 bytes
SHA-256: c2470bbfed245d46328ae05df8e0ca0a137ef1aea06cec50b96e05a7a822d174
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 11388 bytes
SHA-256: 71df983708413d1bc364fd50e4ee1d10da4c909cb34453dbfe0795be2b35b4c3

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