Malicious PDF — malware analysis report

Static analysis result for SHA-256 628f8506a1f71025…

MALICIOUS

PDF

118.8 KB Created: 2021-02-23 14:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d28f4e9eb2534fec332bd1fb0e0edfd6 SHA-1: 3b56f53f640f9bd5f731e9f16826d3c82c5cd985 SHA-256: 628f8506a1f710254d6cabda15743851ab04f23982519c37bc8f6270de10f8a1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://jottigo.ru/wb?keyword=viper%20alarm%203105v%20wiring%20diagram', suggests a lure to disguise malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/wb?keyword=viper%20alarm%203105v%20wiring%20diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5fde108232bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_6029a19056bee.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/MTvhgVn/rc-_airsim_rc_model_airplane_flight_sim.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/5782547.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/cjhEjgH/royal_caribbean_cruises_stock_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/Rgjbige/brick_breaker_supreme_court_cases.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_6001c024647c9.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/gijKJjd/lagobisumavidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_6016363f58838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ff8b1298792e.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/dedinavesute/din_2014_bold_free_font.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/bosch_fridge_alarm_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/14382232985.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/9077587855.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/dilinimaparuxulekam.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/local_area_calling_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_off000193eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193EB 5700 bytes
SHA-256: b400753e6d70ce0ac200c396fb7442a9e58c531a0435a4d25f5da5a7d2c080df
font_01_sfnt_off0001a763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A763 11332 bytes
SHA-256: 794a462acc01aaa66f4ba29d4cc9baa72823bf7c972ff07d42a8c6b432fb40f9

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