Malicious PDF — malware analysis report

Static analysis result for SHA-256 3632e7e17da5576d…

MALICIOUS

PDF

75.7 KB Created: 2021-05-21 01:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 13d5b9bb1a0c7e85d41d63d06b6affad SHA-1: 89fc88bb091e53a56812e05f2f95f4d6cee7735f SHA-256: 3632e7e17da5576ddfe9341e8158145730d409405a41fedcf5cb64fe99a43fef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=salangai+oli+tamil+movie+video+song+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491148/normal_604b54cfea931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5fd0870a4258d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_603b02ee4d9b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453329/normal_6000b43b97520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6014308d12c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_605a01973b1af.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/fiwulavez_detumutikobuf_tadevabunubuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_600984ca9f776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_604993c40922d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fd34d6ad284a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fdb62d569199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_602d56d19893d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_6066977bb93a8.pdfIn PDF document text
    • https://lorebanoga.weebly.com/uploads/1/3/0/7/130738704/e312a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_603a664968282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5fd2d721cbc51.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/24ac195de282d6.pdfIn PDF document text
    • https://safubijob.weebly.com/uploads/1/3/2/6/132682970/mepegigokeso_panibisoki_bonaved_xakekem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386824/normal_5fe63b64f00ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6056c84ad9750.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/6f3aa163-6b63-48b6-9f57-fd1a2f31fc66/pugivizaviga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4aeda47-9d29-40b5-9a5d-5a703310b37a/zezazopozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a1a424-bc9c-419a-8245-72d58d2bd99a/74246986699.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 5304 bytes
SHA-256: 1a1c67bbfa1e2b412f115860ed8aa6d24a0ee3537d1e092d29dad4700c60b5a1
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 10376 bytes
SHA-256: 3eebc620a65b99e0bd99820db573b98577c2865adbb379f4b250fb8f1c93e2b0

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