Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02ff1ef5cf12580…

MALICIOUS

PDF

66.2 KB Created: 2021-02-16 18:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b4ebb50cd59329414b87ddfc590e3b18 SHA-1: 5bc58ca0c2be00d90fb44108f3593ce8afbb9013 SHA-256: e02ff1ef5cf12580435bbb67622622cdec2ec940565ead5b86a0a811b925aa16
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://crophysi.ru/123?utm_term=nixon+blaster+instructions PDF link annotation
    • http://meriline.store/jadufexixedovowivejewugqq3al.pdfIn PDF document text
    • http://pmaider.com/56331876830meqvn.pdfIn PDF document text
    • http://carbags.site/mijomarubaroraleqqvas.pdfIn PDF document text
    • http://frukt.space/animorphs_book_8zw8pz.pdfIn PDF document text
    • http://netewe5.xyz/9749991227y2avw.pdfIn PDF document text
    • http://bezprovodov.guru/bethel_music_no_longer_slavesbi977.pdfIn PDF document text
    • http://constructionhouse.info/974099790378b08k.pdfIn PDF document text
    • http://trokot-roznica.xyz/7421340350584229.pdfIn PDF document text
    • http://circus.market/grade_12_chemistry_vsepr_worksheet_answerszav7g.pdfIn PDF document text
    • http://tipografiyav.moscow/baron_typeface_free_downloadx5doh.pdfIn PDF document text
    • http://ratebekanolaja.22web.org/bukirasisesilitikixivib.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/mokuwanibof/runoriwevetugititowovo.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/vawedifepiximusimizoxev.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/36380242311.pdfIn PDF document text
    • http://diruxepuf.epizy.com/lufurukifevedibafajoru.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_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 4968 bytes
SHA-256: a50299f42e4f4da018fb454c45b657e57f6ba5175724de3470c06b150e680b85
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 10388 bytes
SHA-256: a10e5f315b628259456342c4a033f6a4811d5c263d04af95734673002ce719b4