Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10453cc30c78f66…

MALICIOUS

PDF

68.3 KB Created: 2021-02-23 20:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 032e95c33f5a6bd63f38a2c0a0e48798 SHA-1: 56adeaa8b86fd72445413fa0329b65cea0dce05a SHA-256: c10453cc30c78f669673a1a69af5b1ec7c3858c5f340824460051dbfbfcaf626
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect the user to malicious sites, potentially for credential harvesting or further payload delivery.

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://druttle.ru/123?utm_term=fingerstyle+guitar+tabs+korean PDF link annotation
    • https://lisudite.weebly.com/uploads/1/3/2/6/132682892/wolodipupax.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/1969043.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/7377471.pdfIn PDF document text
    • https://lurenejaxerugu.weebly.com/uploads/1/3/4/7/134728533/85728fc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459323/normal_5ffd5cf20210f.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/rizijubovapuk/sample_household_budget_forms_free.pdfIn PDF document text
    • http://zapulozamatuwe.epizy.com/tutujijalomilibigiw.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/xalomidupexigaxewekuvoja.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/67258765706.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/alesis_v_mini_software.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/dawavitonu.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/82018825992.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/happy_birthday_sheet_music_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/zewal.pdfIn PDF document text
    • http://mubadel.epizy.com/foganakeleduf.pdfIn PDF document text
    • http://zafipuzekamezu.epizy.com/5685071457.pdfIn PDF document text
    • http://kufusesivavisiv.epizy.com/matilda_english_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/nudasijaked.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_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 5116 bytes
SHA-256: af7b59b8c4363a219ca5b8e05ad8c1379da83a9a384e29ea4ed1bf15f562065c
font_01_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 11040 bytes
SHA-256: 6a7709dbc93143b7bd3b4581b8a41c4db2843075ae0b7fec014410f8ea7a2bb8

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