Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55ad824dc534b0d…

MALICIOUS

PDF

82.6 KB Created: 2021-02-17 10:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2715a57d3589af4bbc566c966d07e89d SHA-1: 4eaa2bded7a203e771b00985e00ac8e5d91a26ab SHA-256: b55ad824dc534b0d9eb685013e19a44c3aeb14f36a82821468622e8deaddb66b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to potentially harmful content.

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 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.
  • 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://druttle.ru/strik?utm_term=what+is+functional+grammar+pdf PDF link annotation
    • https://tadirexexex.weebly.com/uploads/1/3/2/6/132695418/f86c08cf92bb.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/ha0FvoH/jumpstart_kindergarten_2002.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/7ihmlje/19056567010.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/behygjx/swepco_arkansas_pay_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/6hthjjf/butojejudefikimade.pdfIn PDF document text
    • https://cdn.sqhk.co/fekebazi/cd8jfgP/72642894118.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/dNieO9y/27818319846.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/gfk56ji/drag_racing_cars_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/cQtjdQc/counter_attack_multiplayer_fps.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/Y3hapig/echo_voice_recorder_app.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/iigehg7/38231031540.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/fevuwufosanagofukok.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/iegiUic/67071428117.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/fuwawibu/aparichita_kannada_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/backslash_regex_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/vojaposasomur.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_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 5580 bytes
SHA-256: d58eb2e733688ade4ce829df07fc80f51350e949bf6fb00290d7c3e940314f97
font_01_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 12568 bytes
SHA-256: fb06d391ab2d1370e33789825b2583a90aab88c42309df84b43cef858e51535a

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