Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ac17e1a4f55c25…

MALICIOUS

PDF

64.8 KB Created: 2020-12-16 03:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3660c8d8872b265d1cbfa8936c4a9066 SHA-1: b88a3abcf83b45ae6aee7a2db930a6f683303d26 SHA-256: 18ac17e1a4f55c257d08c1d7e5be52e84e609cbb851e648a810fab8972ef0dc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://traffset.ru/123?utm_term=prefixes+and+suffixes+games+ks2', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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 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.
  • 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://traffset.ru/123?utm_term=prefixes+and+suffixes+games+ks2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383689/normal_5fcd7ee41611a.pdfIn PDF document text
    • https://lejomibis.weebly.com/uploads/1/3/4/6/134657815/33b6f41.pdfIn PDF document text
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/ranogovokerid-tilufewaxite-lawizipidagoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/exponents_review_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4f5f8e-8dbf-40d2-a84e-80b544df05ee/59366464200.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/august_monthly_current_affairs_2019_gradeup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e0d272-abd1-4f95-9b1d-048051abe6d8/xofivajosekozemalilefezoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79459146-fb4d-4686-83f4-f77d1577e9b7/nowixejubevidawalavaxib.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/cursive_handwriting_practice_sheets_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7111996c-3877-4313-9662-8f8611836bc0/senosenozijazasonewevu.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/cbse_answer_key_jee_mains_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa87643f-5692-4c91-9eec-867bcd726bf6/wimevozizuje.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_off0000c15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15E 5460 bytes
SHA-256: 81366a5d5d3261d0098f91a26af05deb736b91c49b4c3717ab1b61536ce0d06d
font_01_sfnt_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 10336 bytes
SHA-256: 9bb7050263d4fe28b716a8cc9b28f2197bcad867366af9c8fe62874d26e7dcca

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