Malicious PDF — malware analysis report

Static analysis result for SHA-256 5369633a39836917…

MALICIOUS

PDF

81.3 KB Created: 2021-02-23 14:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f3f2936977278f6f82fd20c45e15841a SHA-1: c1687bf232635c0bd28eba3228ed5b253b88ea7b SHA-256: 5369633a39836917bf43ed67926dccf1c85768e59e6bf30ac1998747c2b9cd6f
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to statistical distributions, likely as a lure to disguise the malicious links.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=what+are+the+mean+median+and+mode+of+the+standard+normal+distribution In PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/3758493.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/7b3294bdbe04d8e.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/3869184.pdfIn PDF document text
    • https://rixotojar.weebly.com/uploads/1/3/0/9/130969533/915299ecfcaadc.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/07a173bd17.pdfIn PDF document text
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/nakeruveralaxog-titafixoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_60282f29b6578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5ff9f9a3ddeb0.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/1756317.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/vuxepipil.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/wopari/livingston_county_sheriff_ny_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/animation_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/jeppesen_general_airway_manual_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/bmg_fluostar_optima_software_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/lonely_lovers_line_dance_step_sheet.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_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 5300 bytes
SHA-256: 78e753230bc309228063c57669eb0281e92bbd5eca0e778c04a6a9efd87c8475
font_01_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 11736 bytes
SHA-256: 24d1192c84d2a24c9c3c4884891fa6be5b6d0f1c7446b6d5eaf9b43bc7c081ce

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