Malicious PDF — malware analysis report

Static analysis result for SHA-256 8173ef4e76ae6fe0…

MALICIOUS

PDF

68.8 KB Created: 2020-12-18 06:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 053b66ca400a8b7bfe62dfb10a86a242 SHA-1: 1b53dfee5a94bae37bcf19fc61a3a5baf357171d SHA-256: 8173ef4e76ae6fe000ba268456d88a9ebdbb0638116a4083b51f1ac7089bc7a7
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic to malicious or phishing sites. The primary URL, 'https://trafffi.ru/strik?utm_term=nba+legends+game+hacked', indicates a lure related to a hacked game. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the PDF structure itself is used to host and redirect to these external resources.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=nba+legends+game+hacked PDF link annotation
    • https://pujuferot.weebly.com/uploads/1/3/4/6/134657525/b2786e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f8ca53e831f6.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/b95e1a22c809.pdfIn PDF document text
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/zituto-litis-jurupu-nanaxavuviga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5f9d1bfc33d0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5fc3ba7d113d4.pdfIn PDF document text
    • https://zaderoxuk.weebly.com/uploads/1/3/4/6/134694825/sibofades-jivozaberuk-faboxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f8763fc9e0a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_5fa1e571407c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405638/normal_5fcb410601d91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc296788787e8798976c150/t/5fc7d2aa21434e2273480555/1606931115360/motanosesipudipobosatagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f63bc2f0-3c4b-4fa5-8a53-1d8a4cbf4dd3/under_armour_headphones_wireless_rev.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc39df63c6ccf69f3cd6cfd/1606655482770/lavergne_high_school_address.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_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 5432 bytes
SHA-256: eb1c6ba197db380b7b66406102824c76961a017e6687c56d1e918fd50a952371
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 10308 bytes
SHA-256: 5e51822c39696ee00934c412455f1def2924d34a08224a645fcb722afcdbbbde

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