Malicious PDF — malware analysis report

Static analysis result for SHA-256 da40fcc74db42537…

MALICIOUS

PDF

69.3 KB Created: 2020-11-09 23:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1fe3bb3f8ad67830c71653670ec482f8 SHA-1: df86331c03da084f311ee1f07c373f0eae1f6839 SHA-256: da40fcc74db42537a30d646f019e51f5a7c181f33c6a9b0f5521d1955cc92e64
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure indicate an attempt to direct users to potentially harmful external sites.

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://traffnew.ru/123?keyword=5e+vanara+race PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f90b410e2b29.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/nesubine.pdfIn PDF document text
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/b71d4048da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5fa08d06191d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5f9766c95e553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fa122b6b2940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5f9dc5652cfee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_5fa52ae378dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_5fa861379f902.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/5931460.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/kofabube/tidatifa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/sepsis_puerperalis_adalah.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 4672 bytes
SHA-256: b29cfb5d05f157fabcb58188bb9fb28115dfbe98bae0064cf0e50230718f393d
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 10604 bytes
SHA-256: e6e13b6cb8d3463d987d344fae3469f5f50aaf45b7349bcfc853612b2b905e91