Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3269fe2f0926f9c…

MALICIOUS

PDF

75.6 KB Created: 2020-12-25 16:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eb29ca96e2750dd052b732de7881c191 SHA-1: b267d2fceae8012d5f3058cc1c131aad35c0a51d SHA-256: d3269fe2f0926f9c2ab6fc171e08682e580f7fb7fe04954d9a18e72d1cfa3774
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDFs hosted on S3 buckets, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs, 'https://traffset.ru/strik?utm_term=online+games+with+friends+web+browser', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

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://traffset.ru/strik?utm_term=online+games+with+friends+web+browser PDF link annotation
    • https://cdn.sqhk.co/bibunifez/K9ggGji/zerititikolopewotenagagit.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/giwoxufoto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fc62fd5039bc.pdfIn PDF document text
    • https://duniripil.weebly.com/uploads/1/3/4/6/134667737/9147282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5f8f4633efd92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fd1fbefaf8dd.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/zugowos.pdfIn PDF document text
    • https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/lakoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/sononipo/jgf6ahg/fidget_spinner_pro.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/vovopafubipu/bounce_dryer_sheets_toxic_to_dogs.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/borges_das_aleph.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/bogufuw.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/portugal_mapa_turistico.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/kutis.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_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 5580 bytes
SHA-256: d90ec2d0259efb9e145f0a7868d51db7cd27e1314b9332278f8ac44aca3a0349
font_01_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 10292 bytes
SHA-256: ca5a0c59769020d91117c964a8ab085d2bb290e43d923f9b6a7a6d092f556c90

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