Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d020a7003244f8f…

MALICIOUS

PDF

68.1 KB Created: 2020-11-23 14:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4f54c835fd2fed49c9e6f35d91a70e84 SHA-1: 5f82ce2d285c0c7e7023263d0f257bca016ddd7d SHA-256: 4d020a7003244f8f50b519b48619c521e743c9e8f3cc0b3a7afa004179870ad2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam operation. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs indicate a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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://traffset.ru/strik?utm_term=list+of+complex+carbohydrates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f87564152aa9.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/5645594.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/7841435.pdfIn PDF document text
    • https://dokoxinizim.weebly.com/uploads/1/3/4/3/134305801/8063060.pdfIn PDF document text
    • https://jaxuguduju.weebly.com/uploads/1/3/4/4/134442137/e39704a0c81d7.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/vosexeromezewamijegi.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/fe755e646bba.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/rekibedafowow/junior_high_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8842b82b-2e40-4863-9cf5-bec3fa9bc77c/8274135460.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/true_colors_test_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/1040400202.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/g_line_schedule_saturday.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/beautiful_mind_korean_drama.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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 5680 bytes
SHA-256: 0cb09a4ab0fd7417734c944e7b0752ce5f3cb31877542e390cb5339e5a402934
font_01_sfnt_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 11876 bytes
SHA-256: d01e730707823b63cbd576ad92215ac8b0b7d1d8644b439e4bd006d18f3c6f9b

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