Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81d58e9068c5290…

MALICIOUS

PDF

83.5 KB Created: 2021-06-14 00:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed11531ab58e79fdd371e660b5ae20a7 SHA-1: 03d5d978f14f80d83e4cde857e88dab078dde682 SHA-256: b81d58e9068c52904647d3236498a6e76067d7e22789ea3ce0b134215a2faddf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm designed to distribute malicious content or phish users. The primary malicious URL identified is ketchas.ru, which is likely used to host or redirect to the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/pbw?utm_term=nenu+sailaja+movie+online
    • https://cdn-cms.f-static.net/uploads/4415745/normal_606c2d912bc57.pdf
    • https://pureveruzidupuz.weebly.com/uploads/1/3/4/1/134108723/pejaxajekemefif-nalimopenu-nedis.pdf
    • https://motubisirewu.weebly.com/uploads/1/3/4/5/134529252/lososiroxarezi.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_60538d2d5fc2b.pdf
    • https://wagebesalumiral.weebly.com/uploads/1/3/4/8/134846814/580bd69b6702.pdf
    • https://sibiwowimi.weebly.com/uploads/1/3/4/8/134868192/2722508.pdf
    • https://static.s123-cdn-static.com/uploads/4480403/normal_5ffcb5232bf28.pdf
    • https://fasanisig.weebly.com/uploads/1/3/0/7/130739318/sadeboripijo_mokirefezim_sovusuxepik.pdf
    • https://cdn-cms.f-static.net/uploads/4451377/normal_60443aded0400.pdf
    • https://cdn-cms.f-static.net/uploads/4484364/normal_60254bf97631e.pdf
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5fcba1077afd5.pdf
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe40b373d9f6.pdf
    • https://karewugudamebag.weebly.com/uploads/1/3/3/9/133986918/dumabedolugativ-gelorugerib-mebovogipuf-nurabipeki.pdf
    • https://cdn-cms.f-static.net/uploads/4418401/normal_600a944fa2a35.pdf
    • https://cdn-cms.f-static.net/uploads/4467577/normal_602ce56ee6a04.pdf
    • https://divisekul.weebly.com/uploads/1/3/5/3/135347680/a96b602ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://varulemenel.pbworks.com/w/file/fetch/144648756/nys_dmv_odometer_disclosure_form.pdf
    • https://uploads.strikinglycdn.com/files/4a23f6b8-9b41-4dea-82e9-53ca57c1d118/42022695790.pdf
    • https://uploads.strikinglycdn.com/files/932e90b0-cd29-4a7b-94b1-fe08464701ff/cms_grievance_response_letter_template.pdf
    • https://uploads.strikinglycdn.com/files/9723f560-4963-42ff-8cab-0176eef49fb8/nojogo.pdf
    • http://vevokofeju.pbworks.com/w/file/fetch/144924138/50_shades_darker_full_movie_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e964.bin
638834ad3824a1a894474e2a4456654c8a3cc7a1401b9b8099678acdbd85c137		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 4840 bytes
font_01_sfnt_off0000f9d8.bin
e023746aa7c55f4568b31df0ea6f9eb4ce846f9afd052d4e4c9a995231992f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 2848 bytes
font_02_sfnt_off000105eb.bin
8df85b9e0b1309d64eb5958423465c4af4039d93a845eb96bf8140cbe18080ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 10728 bytes
font_03_sfnt_off00012ae5.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 16164 bytes

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