Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e1d6971c9aa74d…

MALICIOUS

PDF

74.6 KB Created: 2021-02-06 21:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5a30e3bbcd64fc4a01a9ca219a457257 SHA-1: 8dc2645ebc567582f3bc732cef64ea5c4cb8bf93 SHA-256: 63e1d6971c9aa74df16e9ab42d159c8ef8130e1b07b7d8bb7d4539382070c89b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/aws?utm_term=autodesk+sketchbook+pro+apk+latest PDF link annotation
    • https://suviliter.weebly.com/uploads/1/3/1/4/131453542/4e769d55.pdfIn PDF document text
    • https://cdn.sqhk.co/woledowo/P58sgcH/serobutetivopino.pdfIn PDF document text
    • http://itawegan.space/xijoxasaditabatolu3wp.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jji5hhp/dimupowefuxeriponunizemib.pdfIn PDF document text
    • http://vurapajojijare.22web.org/spreadsheet_for_tracking_rehab_expenses.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/qMjfvzY/zuguzimanowuvinunavix.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/094a6064262d.pdfIn PDF document text
    • http://grinallex.shop/kuzazusenx0onm.pdfIn PDF document text
    • http://setofexperience.site/nabibogor477n.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
    • http://bawilifugoxak.epizy.com/request_credit_report_transunion.pdfIn PDF document text
    • http://gijisavapazixi.rf.gd/absorcion_de_un_farmaco.pdfIn PDF document text
    • http://tanijug.rf.gd/97431971304.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/vyxyn_co_f9_answer.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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 5080 bytes
SHA-256: 72be5800d2ebfecf241a0c3687a5e541b31d6ae7d40f027dfa49a09b6bc454f2
font_01_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 17100 bytes
SHA-256: c3c1c23858811fbdee61ce1e14ab1a0109c9f3c3803bfa660bc988bf10365811
font_02_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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