Malicious PDF — malware analysis report

Static analysis result for SHA-256 92394a57155164f5…

MALICIOUS

PDF

88.8 KB Created: 2021-03-20 09:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 83d197255d8bd0fc0d0ba1991f4de8a8 SHA-1: 7637a378b8db7cf226b20ea2aa54ca6204b86d01 SHA-256: 92394a57155164f52e2a45eef54953660ee23f0f33815f4399aa9f1d6d269fd2
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a 'download' button heuristic further supports the idea that the document is designed to trick users into clicking malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=applied+mathematics+3+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd343a88f577.pdfIn PDF document text
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/fofufufupimaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_60334a36d6afa.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxofepure/k1ccA0m/assurance_report_vs_audit_report.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/que_establece_la_ley_de_ohm.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/cpgfidt/lip_anatomy_vessels.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fc8d3fe5c27b.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/tenatop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_6030d949a5d70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_6005458144663.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/tuzomi-nubugagizupegug-vupanufipebebuk-lilarexe.pdfIn PDF document text
    • https://zowadite.weebly.com/uploads/1/3/1/3/131380399/jugulo-fugaxisevori.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/3880972937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_60541ece2d8d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5ff3d52daa151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_600c210f65f70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_dd9d298d96e341378054785fcd343d04.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_c6f5ef341782494f9b38c7a3fdf84aa9.pdf?index=trueIn PDF document text
    • http://goxafebo.myartsonline.com/70777851523.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_bc567b6fa7fe408eb83111d0afdccc26.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_2f6a6e5fbce64b0d894f6fe9fd1afad9.pdf?index=trueIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_fd463d66fd1841aeba4e6eb075da961b.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 5544 bytes
SHA-256: e223341013625357e3faab2a68ab156dc610209e8fa75f06ac16e61aaead1771
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 11124 bytes
SHA-256: b5d3227d0bb8bb48e5a9717b3001b0c6fd727552ba9dd33d034291eb552463b6
font_03_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 8712 bytes
SHA-256: ec2ace672a3979ef45de066fc446f625a454ae4e90e4b274e0c3a5c09d99c89a

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