Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b34ca98d755e91…

MALICIOUS

PDF

72.7 KB Created: 2020-11-13 09:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8eeac2fb5c5b1c3768bf1f8a2dbbbe10 SHA-1: d6d1f2212906e1526ad7cb8e0177b0bc7d3e4e8e SHA-256: 55b34ca98d755e9145484782793a61d7a2a907d01220fe1e010e7ebc74eaee94
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=2012+chevy+camaro+ss+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f91a859559a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5faa3225d3f6b.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/muluk.pdfIn PDF document text
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/sakozow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_5f934428a8976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425211/normal_5fa308c185bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fa1b5b05dad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_5f99777a250e6.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/tobobowu/angular_5_ecommerce_template_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f7bce0-e09c-4e25-9fda-c2633a5183ce/zonivewuwolizow.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/xapuvekelavegamoge.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/brche_addieren_subtrahieren_multiplizieren_dividieren.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/dugozexisuka.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/primary_applicant_copy_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3b23bf-55cd-4f3a-bba1-839b295d49cb/74172606379.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_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 5524 bytes
SHA-256: e67b0d38ed10453c12218f77a14890cc2fd6d9b7a00621511437810ebd408ce4
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 11952 bytes
SHA-256: d9cc6967adf0ac8c7ead0e837e09f856107b52c8f333395ed558e6754e7eb97d

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