Malicious PDF — malware analysis report

Static analysis result for SHA-256 f525a90b5e38fec9…

MALICIOUS

PDF

72.6 KB Created: 2021-02-12 07:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 76653c0f5ca027d9cb3a15e4bf55152c SHA-1: b8740ed52a0f030a2f5111a0234a834ce06cafff SHA-256: f525a90b5e38fec9da5e239347884465d3c1117cd0e3a609c2550977dc999115
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain search terms related to drivers, suggesting a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=dell+inspiron+6400+drivers+windows+7+64+bit In PDF document text
    • http://vakexuk.22web.org/phonetic_transcription_exercises_british_english.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/5026135.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/how_to_teach_listeningr6oys.pdfIn PDF document text
    • https://powipopes.weebly.com/uploads/1/3/1/4/131406611/mubobepuzom.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/fatugagaxeg-ganatisix.pdfIn PDF document text
    • http://prostosite.site/determination_of_flakiness_index_lab_report_discussion4r06g.pdfIn PDF document text
    • http://populiro.iblogger.org/nice_guidelines_hospital_acquired_pneumonia.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/8988905.pdfIn PDF document text
    • https://tazesudi.weebly.com/uploads/1/3/0/9/130969012/7839635.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowiseli.epizy.com/saxepuwetapemuv.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/block_monogram_font_free.pdfIn PDF document text
    • http://durevitulo.rf.gd/angulos_en_la_circunferencia_problemas.pdfIn PDF document text
    • http://kilubediboxut.rf.gd/bed_bath_and_beyond_white_twin_sheets.pdfIn PDF document text
    • http://rodobokojezaga.epizy.com/surakulirafaxeja.pdfIn PDF document text
    • http://notavopanugatog.epizy.com/geremoligiros.pdfIn PDF document text
    • http://fotopokidag.epizy.com/koxusini.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 5500 bytes
SHA-256: f96961ea8ba3522e58806217e7c9a7ef500638ecd4357bb28cc2389c3cf1e8ef
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 11892 bytes
SHA-256: b695cef31e3ec73af41b389455bd7703af583c8eba5d286faf32d02b1066c0da

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