Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4436f0efee983f…

MALICIOUS

PDF

83.7 KB Created: 2020-11-10 22:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 12bea1acad3d93e410113994ef593a52 SHA-1: 15e68218578c6c97c898aff88dd77ad985651c34 SHA-256: 6a4436f0efee983f93eb57d7ba9f60ff62a353e6223975c5e3ac491c2ba1e5fe
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. 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 numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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?keyword=snoop+dogg+world+history+review+answer+key PDF link annotation
    • https://wetejitaxazis.weebly.com/uploads/1/3/4/3/134306742/zalir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_5f9a0a012d378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8c8db0ba67d.pdfIn PDF document text
    • https://detalejutapebis.weebly.com/uploads/1/3/4/6/134610814/kiniluvajuzi_godaxu_vuwiweporunitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_5fa4204a55957.pdfIn PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/03f6cfe6d5.pdfIn PDF document text
    • https://kidofepakanuzok.weebly.com/uploads/1/3/4/0/134096393/300d78213.pdfIn PDF document text
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/betipilop.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/gixitodivuz_zatide_janeluresirozu_wixafisesifol.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/5095107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a792e180-7f1a-4353-ab71-f1fd4c03f6c1/39672951719.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/sorigetufugolukewe.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/84970641132.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_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 5644 bytes
SHA-256: d1714868bc6fe07d8f8fb1d43489b8e675f4f7c48e1f6543ca67a0066f71363f
font_01_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 11192 bytes
SHA-256: 6ab9b9ccec15b6483cc05cc46ce35219b89c83f43cedf8b577749ce1ddc5e2ea

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