Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8426f57b4f85aa…

MALICIOUS

PDF

92.9 KB Created: 2020-11-19 07:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f4361f07fbf6c2e2f60280b93f23070e SHA-1: 4edd6f24c722ef08e3acb0fc16630d385d49fe97 SHA-256: 1b8426f57b4f85aa9f232dd33a178af56211909f6bc7c941c095ec8c965397c5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic detecting a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'tall tale example stories' and metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO-spam PDFs. The presence of numerous external URLs, including one pointing to a potential phishing domain, supports the conclusion that this file is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/123?utm_term=tall+tale+example+stories PDF link annotation
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/a93c53d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f9c96c898fe2.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/xomireliz.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/tadovu/pazukipemovuropasepotiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/56352515933.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/noxuguzu.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/38080292263.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/notusegaja.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/boolean_search_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/inequality_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/70440326550.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/sugafunusolozom.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/4584871098.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_off000132e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 4980 bytes
SHA-256: 77b1af572f9964b09c74358edc2659d283a787af425738f3995bd78fb6347878
font_01_sfnt_off000143c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C0 10236 bytes
SHA-256: c86a312ff8688f6e51ffd20a75a7181a1310b10d8d03923ad563e6cdba17396e

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