Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3590267b2b25aa4…

MALICIOUS

PDF

77.0 KB Created: 2021-01-23 00:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9668a0ce37b4c8158e5d282c713a7517 SHA-1: afe0e31608dcb0102ffb7362251843dc5c0834db SHA-256: a3590267b2b25aa4be0505acde68181a3fb7cb42d404b605cedaeccb98e53a37
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 pointing to Weebly and S3 domains, suggesting a link farm or content aggregation strategy. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=vampire+spawn+5e+aidedd PDF link annotation
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/pibavas.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/Miicij9/ham_sandwich_definition_urban_dictionary.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/4533246.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/9034623.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/ObgjghK/17674286466.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/nofiwivi.pdfIn PDF document text
    • https://mobejameraxoluv.weebly.com/uploads/1/3/5/3/135316129/bodekofanajo.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/4487344.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/jeCihWK/kogama_adopt_me_pets.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/vumawosar_rawaven_ganoteligoza.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/kozibowisenatu/difference_between_ice_sheets_and_glaciers.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/goku_vs_android_19_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/college_algebra_textbook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/22397735113.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/4931365035.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/apc_smart_ups_1500_usb_software.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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 4852 bytes
SHA-256: 600bfc43e1ce47fccabc77da830f952cefbb7bfa23af10d9b75f134b27ff28cf
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 11016 bytes
SHA-256: 982cdeefa115765a0a4e4c00abb81e812f64afb634e37bfeb5366d9444221e3a
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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