Malicious PDF — malware analysis report

Static analysis result for SHA-256 af84015fa48c6e24…

MALICIOUS

PDF

75.7 KB Created: 2021-03-02 11:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02af0170a3d00ac1097c129375b3ea3f SHA-1: 31fac2b173067a9a32f60bfd3b54b990a13645c6 SHA-256: af84015fa48c6e247f9279a6986dce51c8093cc91b470da91143eda8404a8c63
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed 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 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://nipisod.ru/wix?keyword=focusrite+scarlett+18i20+3rd+manual PDF link annotation
    • http://regvoolkim.website/mepojulibiminuxuvafetwkpe3.pdfIn PDF document text
    • http://ch-redirect.icu/medha_suktam_telugu_meaning65cnx.pdfIn PDF document text
    • http://cabinetshq.xyz/mini_dachshund_puppies_for_sale_au3fsrm.pdfIn PDF document text
    • http://123dutch.com/kuvadorarodetabitezaxewewjoiwh.pdfIn PDF document text
    • http://reliables.ru/positive_reinforcement______________and_negative_reinforcementjdbfd.pdfIn PDF document text
    • http://successinyourlif.website/85747470157jyql6.pdfIn PDF document text
    • http://lizakoku.22web.org/82156457154.pdfIn PDF document text
    • http://petersikdar.com/60768130116c57w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafuwite.epizy.com/topolawagu.pdfIn PDF document text
    • http://venuburut.rf.gd/jokosiposulesopili.pdfIn PDF document text
    • http://katudajug.epizy.com/oneplus_7_android_10_gcam.pdfIn PDF document text
    • http://kibululugavi.epizy.com/chrome_cache_files_android.pdfIn PDF document text
    • http://wunilos.epizy.com/petalarexu.pdfIn PDF document text
    • http://kepipejesa.epizy.com/sifuvu.pdfIn PDF document text
    • http://nepowatalol.epizy.com/korinewomiwegufarix.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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 5724 bytes
SHA-256: 59e285bacada8c0aee2fd56d8625fc3fbeada18b59542c92ea3cd023042e9886
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 14084 bytes
SHA-256: d60388347dff3494f5d7f680b454859792fb50e5bbec7bedc471e788c971f996

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