Malicious PDF — malware analysis report

Static analysis result for SHA-256 1601d231ee64d75b…

MALICIOUS

PDF

81.2 KB Created: 2021-04-18 06:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5363c8afc8a5b459ebfe9f5e09718265 SHA-1: 2e2c3894541bedf33b2b56bab0692e922c7530c1 SHA-256: 1601d231ee64d75b26955e4d713ee3d659a3ec0ae76f1a23705c847f5ef8c8fa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=myers+briggs+test+career+choice PDF link annotation
    • https://cdn.sqhk.co/pesenexur/iFDiaPA/snowboard_master_3d_hack_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/9hf5E62/96457190730.pdfIn PDF document text
    • http://metryck.info/soccer_drills_for_4_year_olds_videoqhnr4.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/iiRUhfy/square_body_chevy_for_sale_in_oklahoma.pdfIn PDF document text
    • http://blognews.top/cibola_burn_explainedarqn3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60186d90e367e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_602de40ee9625.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/6mgcje6/6466845923.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/80a49b2049.pdfIn PDF document text
    • http://ludshop.xyz/jovizikobodoxuxfadfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381108/normal_5ff852a9c6d22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5ff7f7d8577be.pdfIn PDF document text
    • https://totovipuvo.weebly.com/uploads/1/3/2/7/132740708/bixudiduvo-wafazu-gijobekuj.pdfIn PDF document text
    • https://pidexijot.weebly.com/uploads/1/3/5/3/135316959/397271.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/foxifukabutigawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20393c5-c603-44b9-a8f8-18d595b2ac66/popupevijijapexido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4682f3a5-2346-43d0-8c1b-28c13ed6a346/jipovur.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_68580d541ae84b20a93544dcb973fada.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24235be4-183b-49c4-870a-31e5166d0aaa/molecular_biology_jobs_atlanta.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_5a000356917340ab8cf61c3bcdb51800.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_936a2ca389b744338a2d7af3a0a2961e.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_619de6518dfb4caeaa4f9f831090aefc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ccd164e-ca2b-4325-90e2-66af9531e01e/ludupuwojojinekodu.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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 5276 bytes
SHA-256: 36195afe4d68c45a43ab3b3c55143f93204a5fca71fe3b9d470643238fe1a431
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 11016 bytes
SHA-256: fa0d17eeb061ff363376d3999c0cce9a3937df40430e4fd1feda333f5c820565

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