Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a126304107268e6…

MALICIOUS

PDF

79.5 KB Created: 2021-02-22 06:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3813b96bef256d5373087afcae526291 SHA-1: 2b4fd7373764e5be955275e9d80c59f1d2735725 SHA-256: 5a126304107268e60a80218920f3b4013bf04179aca73e6713acdb8c21df7e01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=se+vuol+ballare+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fdff28d8be49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_600de9355523d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466996/normal_6022cca4e4112.pdfIn PDF document text
    • https://xomepuwosabagef.weebly.com/uploads/1/3/0/9/130969083/nedom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374840/normal_6013f46c34415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fcf8625376e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63d105e272.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402932/normal_60081ba46bc23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_6017649048da4.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/nutafiful-wawexabi-rovajefe-kovitupi.pdfIn PDF document text
    • http://vuwavutos.iblogger.org/natasovapukorovefizax.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/dazifozixawus/rifededojirepetopuku.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/xezevadovoxotudidami.pdfIn PDF document text
    • http://wawuzir.epizy.com/four_column_chart_template_printable.pdfIn PDF document text
    • http://dulubuli.rf.gd/36629259908.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/zenojutukixilukibolovon.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/dodopalat.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/blank_cursive_writing_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/34394340562.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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5340 bytes
SHA-256: d96b34f0f9c75fc0dfa99c012d384dc2794303c082091b1589fb21b0ebfbc467
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 13780 bytes
SHA-256: 43c48a5173671ac827c53065aafaed82587992b907b65d110eae31b018a09292