Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97b8f219b68808…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 12:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 055c8a54ad54dce6ac1479987f760764 SHA-1: f3ee3acdec1ca1e4556a14c23100b1bc8bd7dd59 SHA-256: 3a97b8f219b688085a6ba2f361a2879dbf698b0449a1d0d69631e18e1c9aac92
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://dafemum.ru/wix?keyword=candidatas+reinado+del+mar+2019'. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The document body, though heavily obfuscated, suggests a title related to 'Candidatas reinado del mar 2019', implying a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://dafemum.ru/wix?keyword=candidatas+reinado+del+mar+2019 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5feb1ccde843b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_5ff03d0422f72.pdfIn PDF document text
    • http://vykupavto54.ru/77254575535u8llx.pdfIn PDF document text
    • http://photoforce.ru/89763780213f69vo.pdfIn PDF document text
    • http://detonic-shop.website/39122581443ermok.pdfIn PDF document text
    • http://soldonlakewood.com/jopuzorikilelixobifoku8f7x2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_60142b54e2119.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/5gcCjbm/wolo_tv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/42jfPjd/29341999709.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/sisaxu/80290568085.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/57572185750.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/feximoke.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/alright_vs_all_right_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/makalah_liberalisme.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/mp_police_bharti_2019_online_form_date.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/goginexokomudadikizatadov.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/63298529644.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 5356 bytes
SHA-256: 761d5f9d4cb51faaa90a3dce58e98145fffe984b39a2e83a61660752e881de67
font_01_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 11004 bytes
SHA-256: 69374beabdcaaa93f535d74d4261a7467a626521b50ee878556d09b9c0ef4732

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