Malicious PDF — malware analysis report

Static analysis result for SHA-256 a291a6aa4f92cdae…

MALICIOUS

PDF

101.0 KB Created: 2021-02-02 12:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 75e669b07ef199f77210d9eeeeb4a4aa SHA-1: d8296057b043f5d9d24b064a334a89ae3c16575b SHA-256: a291a6aa4f92cdaed3b94b4cdf748d5c954da80c82b5a828698e02a429914db3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=south+mountain+state+park+nc+trail+map PDF link annotation
    • http://healsmall.space/mikroilemci_ders_notlar9pdrg.pdfIn PDF document text
    • http://pravagims.net/bedomuvodalilik6s.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/jji5jbJ/road_trip_movie_download_480p.pdfIn PDF document text
    • http://smartbright.club/logo_juventus_baru_vectoreui1d.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/97a03d.pdfIn PDF document text
    • http://webdefilmizle.com/1332618837417g14.pdfIn PDF document text
    • http://mosdendy.store/59129716629thnao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jaloto/31740882905.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/service_certificate_format.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/types_of_biomes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/absolute_threshold_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/25928571487.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/huawei_mate_20_lite_android_10_beta.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/78390368272.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 5224 bytes
SHA-256: 8d83d1648e02c0702c50adca4c528327ef9c83f635935db0e2eb256f3eed9abb
font_01_sfnt_off00015187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15187 11648 bytes
SHA-256: 4d58a5928e259cee003fd9c872f0996ce46e55b23eb951fa7c058481baee04bc
font_02_sfnt_off00017871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17871 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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