Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cac57104fa8af3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-14 02:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 139169faa811166dc1f39aad9258ff17 SHA-1: 383abc4a2966b790c3c9e407e914b655be587907 SHA-256: c1cac57104fa8af348e0e7a24abd1b1b4474c71fcd405053e1c2274b822345f7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL, https://vilenefex.ru/strik, is directly associated with the document's content, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://vilenefex.ru/strik?utm_term=african+american+girl+boss+baby+party+decorations PDF link annotation
    • http://fuvagezilavez.mygamesonline.org/anomalias_cordon_umbilical.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/h0bhagf/the_game_of_life_vacations_review.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/RYjjDPO/kenidizejomiruluziko.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/kiwuvuxobub_suvudovavupam_zotiralal_gefodaluxi.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/wusoletag.pdfIn PDF document text
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/7224a68a.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/dovaravomunopap_lutuzifopasogi_xukivukadijarul.pdfIn PDF document text
    • https://vefoduwuwi.weebly.com/uploads/1/3/4/9/134902927/wusekapimilex.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/9b399b16a89897.pdfIn PDF document text
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/7086852.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/bibitarumiko-goxufuz-losadedagiw.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/fenenemenin.pdfIn PDF document text
    • https://tababara.weebly.com/uploads/1/3/0/7/130739165/kebagux.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/purawuma/zofesevogovajarifubusaxus.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/58907084039.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/angry_birds_transformers_jenga_code.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/66968388122.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/aramco_ipo_prospectus.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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5708 bytes
SHA-256: 27c493858fe8ac369ed56ff831143dc04232fa11da9b4ea158a3d0cf19393c94
font_01_sfnt_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 11244 bytes
SHA-256: 1b03f4497d501c36ad3fc13dbef67cf715de49aa0a3838ae3c86d30fe7fa7c69

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