Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b71a16e93705619…

MALICIOUS

PDF

70.0 KB Created: 2021-04-04 09:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 817e0cc9db55f140262baf1ad970f58d SHA-1: efbb642def5421e1d9b97526024fde5e5b364a6f SHA-256: 9b71a16e9370561996676f70e85f027c42c75713e5fbcd4c7c2586133b508925
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external 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://ponafet.ru/123?utm_term=hardwood+plywood+sheets+uk PDF link annotation
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/8212359.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/escuelas_psicologicas_cuadro_comparativo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_606935106dd39.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ff5e7d2e4f30.pdfIn PDF document text
    • https://wikumegi.weebly.com/uploads/1/3/1/4/131407968/4800587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_6067d2c6c52bb.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/18012949768.pdfIn PDF document text
    • http://org-fruit.space/pofudowexolujogapaxmd5.pdfIn PDF document text
    • http://present-mag.ru/1934606840382ljn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_2d94951190c44e2daa292a9a93a94468.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_ef3cca58779f4972a1697680c708f369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/monthly_meal_plan_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/towugifezaxalosasijifo.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/haier_12_000_btu_portable_air_conditioner_and_heater.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_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 5268 bytes
SHA-256: bd48b90a1819d5daaaa2016fe5631d61c3afeec249eb09e216e024abd882cc87
font_01_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 10388 bytes
SHA-256: 5c611f96be21abe3306913a21317c3becada2b20f436f02d0d3b7f2086a71391

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