Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22db46acc71046f…

MALICIOUS

PDF

72.5 KB Created: 2021-05-24 19:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fbaa57371336abfa899fb1caf1c64599 SHA-1: a8e0e3cc405da723dfec2379254d0011c7b2c4d5 SHA-256: c22db46acc71046f5f895a1deceb7059160fd9a3bb82d5112f6ee9927972a2cb
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct the user to malicious 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
  • 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=diferencia+solucion+isotonica+e+hipertonica In PDF document text
    • https://sibubusede.weebly.com/uploads/1/3/2/6/132682984/d2d8116.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/3001996.pdfIn PDF document text
    • https://duzamalati.weebly.com/uploads/1/3/5/9/135986709/wukasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_60160adc08169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_604b0a8f2d0d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5fde501473247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5ffb98e516908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_606156321ab1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_60167f45ef0ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5fc8e2c5c4b26.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/2396662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470205/normal_60077551def96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd77fdf8-94e3-470b-8a9d-589a80b4f4fd/81142616986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d852bed-4c82-491d-a01c-d743581174c6/84832599721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b762629-c6d9-4e03-a83a-d8e03cc01de0/dapazusugev.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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 5104 bytes
SHA-256: 6a76920df099400e03207df07b9611134ae83b92d78910a1819dc447ba854bd4
font_01_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 12312 bytes
SHA-256: b9de4c98aab26a99820c7c3fc53911f4f6215094bf8f30b0b993b3c6cf77d184

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