Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17edff0770ccf32…

MALICIOUS

PDF

66.9 KB Created: 2021-02-25 22:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 8199bc11fe169ae8de5836378be6728d SHA-1: 9cce8cd93a4b4d1bfe99ea09548cb6dd15eddaee SHA-256: a17edff0770ccf326b47e86c208d1857aeddac46cb1d928106624a55124ce7da
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. The embedded URL `https://maypoin.ru/wix?keyword=yaesu+ft+897d+manuale+italiano` suggests a lure to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=yaesu+ft+897d+manuale+italiano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486033/normal_601d1f23b36cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380525/normal_5ffe6fd3e1b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_6016d01f60aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_6010e627c692e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_6029e30ab44c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_602f85edcf9c4.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/xidazeze/american_flag_template_for_powerpoint.pdfIn PDF document text
    • http://terudej.rf.gd/constructionism_vs_essentialism.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/answer_sklep_modelarski.pdfIn PDF document text
    • http://pivesezo.epizy.com/les_miserables_25th_anniversary_epilogue.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/harry_potter_half_blood_prince_drinking_game.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/cobit_4._1_assurance_guide.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/balance_of_power_questline_guide.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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 5348 bytes
SHA-256: e94318d88cc06d09fad87d0ffb461db362049c4d9ef844f1cf9e39c91313f38c
font_01_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 10148 bytes
SHA-256: efd337eb423479dd6b5d60846d4abd7acbbabdf820a9236aca6d94fc8b54e3a6

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