Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5df2cb43a7a7fb2…

MALICIOUS

PDF

76.0 KB Created: 2021-03-04 04:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9345856391140f567297dd6176aee774 SHA-1: 7ed9a5a9c4af117aa42512b59dd5bdbbb4830011 SHA-256: d5df2cb43a7a7fb26595a4974e30340acd3d94f5088c26d471c3ad71b2cd874a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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/award?keyword=elm327+mini+iphone+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410015/normal_6007d8b5db87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_600fc42ecc826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fd118052ca7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_600d0c6cb5459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_602a015dc9ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_603e244ee614d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405662/normal_600b3b18daa5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_60286b2527b47.pdfIn PDF document text
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/1f8d0e80360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421200/normal_5fd99c4f44f1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff76452ea1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_604024bc9d6a0.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/zafirawit/call_of_duty_beta_android.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/muzutupi.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/45060450201.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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 4908 bytes
SHA-256: 88da907c949eacba738aff92178ca5b204970f9f54239d4f1aad8e994ccb5908
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 12624 bytes
SHA-256: dd182d5e16452bbc0ab6eae10dd534d37dd2530cdd357c8975d6c98c149b9936

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