Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7beaee57086679…

MALICIOUS

PDF

71.5 KB Created: 2020-11-18 01:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da45a9f31fcba24a13c860c479374df7 SHA-1: d97be7bc0f21131650626d59691428242366d50a SHA-256: 4c7beaee57086679f1bb42baa2cdd14e96cd423cf09b64dd25b43d2d7b8e021b
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document impersonates a signing service, a common lure for phishing or malware distribution. It contains numerous external links, including one to 'trafficel.ru', suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://trafficel.ru/aws?utm_term=adobe+fill+and+sign+windows++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f8c8377dcff2.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/e5bcd2697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8978493110a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f8937a2b46a3.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/muvinovozo.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/f217a18ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_5fa9916da09cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_5fadc0c75ea3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5fa2a3c5c98d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_5f8cbeb1b7a60.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/gagagakigibapo/transformers_toys_skids_and_mudflap_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/torexad.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/tungsten_guide_rod_cz.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/ncert_maths_class_6_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/apmg_agile_project_management_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/sawamubuzowoxiwevazuwi.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_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 5296 bytes
SHA-256: ba6d0009865422b78e73c3ea10c3c412a109c342caed2fe1562ff6f5ec891505
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 10880 bytes
SHA-256: 4157de13d575f60cac53cc4ef59be8c44cd831f83482df0d45a2c2456136f7fe

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