Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d39ddb57c5ce0d…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 03:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 814e6dae1dcec83d6bd56677b5648818 SHA-1: 20f85570601bda1eff5d02f16b2d60363b6f3941 SHA-256: 06d39ddb57c5ce0de5420261f1411c41d0c8ce29e7a725abc1f28d38fe82b87c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary technique likely being spearphishing attachment to deliver these malicious links. No scripts were extracted, but the PDF structure itself is indicative of a phishing or content-distribution attack.

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://pelibifir.ru/award?keyword=elchuri+ayurvedam+books+in+telugu+pdf+download PDF link annotation
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/mikunigipeli.pdfIn PDF document text
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/dogowaf.pdfIn PDF document text
    • https://lolivifi.weebly.com/uploads/1/3/0/7/130739590/sogipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_600df963e9732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_5ffa336b0c023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_603c6aa909f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_6037062bada02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_60286c904254b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fe5b3a821326.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/69004732201b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5feba50a2e338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fe2924149b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_60498bf89ab2c.pdfIn PDF document text
    • https://vafevovelawa.weebly.com/uploads/1/3/1/4/131407112/kikipape_genurexevade_befose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fca86f085a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_60291ba9d2fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492536/normal_60481ddccb762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_6023c2b35dde6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 5984 bytes
SHA-256: be2a39f37ba01ae51c1579250f1c929e5f2b081a677c526e998c927a400b68c0
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10172 bytes
SHA-256: 5ab76788e84bbf43d1b24951f0709a76aa51f938a2b3f7d00cd3540ee83b7f97

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