Malicious PDF — malware analysis report

Static analysis result for SHA-256 d485e440d358b558…

MALICIOUS

PDF

70.8 KB Created: 2021-02-03 02:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dba8bf20b523c5b6acec5b229e6eb3b9 SHA-1: ca7f64266b8797cb8fb1f5ccd1a800947a5a79d1 SHA-256: d485e440d358b55835019c7c0f736975aa4e8ff15d765af7d03455c3465a95c5
186 Risk Score

Malware Insights

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

This PDF document contains a mass external link farm, with numerous URLs pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://druttle.ru/aws?utm_term=plot+outline+template+google+docs PDF link annotation
    • https://budamasut.weebly.com/uploads/1/3/4/9/134903336/862427.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gighNnR/free_qr_scanner_for_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuxinekowa/igecIif/nagawan.pdfIn PDF document text
    • https://nogetutiru.weebly.com/uploads/1/3/4/7/134711470/5699617.pdfIn PDF document text
    • https://valisuzikejuxeg.weebly.com/uploads/1/3/4/0/134017117/venizoxularal.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/ac39f36934b1f7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_600277bf13a23.pdfIn PDF document text
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/5278203.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/jabofimire.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/tixeligufokup/76413616882.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/assamese_new_song.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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 5300 bytes
SHA-256: 88edba3d97af7f26bc9d8f3c9a830f00755eae65fdec4b7718361278ceec1d62
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 10132 bytes
SHA-256: 384776fedb4562a4c366641409aeb459fd11e71db05f7bafdb198282d32a4d3d

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