Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a227c6ac3712e8…

MALICIOUS

PDF

63.0 KB Created: 2021-02-24 02:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 84e964aeb2016d3c530fcb655003f9c2 SHA-1: 74264e52bae897d77537ac53c89c6298fa91f46b SHA-256: e5a227c6ac3712e8e5d36a1ca10280d5f140dd1971e6c095e11fb413a7b7225a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=nixon+the+sentry+chrono+leather In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5ffc8485159c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366035/normal_5ffaca66b0bc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377400/normal_5fcd5ed9a96da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_600aa806af245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_602c29ed4528d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404133/normal_5ffacfa0263dc.pdfIn PDF document text
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/82a5aa1983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_600327aa16e92.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/6jaEdje/exogenous_vs_endogenous.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6011140ee13b0.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/bIiatKB/nabegofufowutalisizi.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/redegelesibif/81380088321.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/fetivigezamaninogener.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/blissful_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/46263226311.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/nutrition_information_bean_burrito_taco_bell.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/abrsm_piano_syllabus_2018.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_off0000bb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB53 5028 bytes
SHA-256: bf4c443e91a12f5f75a01a48ec0b4cde2c275925fc4d4ec41a52c94b7e69dfbc
font_01_sfnt_off0000cc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC77 10112 bytes
SHA-256: a672337bf6524078e3c38a6f4281a893d399e3d8aa905c0d95a0ebacc596b0ba

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