Malicious PDF — malware analysis report

Static analysis result for SHA-256 4499d45aeb97a836…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 14:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f68c577ea78da0fe8cc6a30be0b1ab3d SHA-1: acd7c7bccf262362c6e4ec92a371b54f98592e84 SHA-256: 4499d45aeb97a8363f1cda6115a46e5d9a5ebc3fcef382756bd8a4dc843ca0c8
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=photo+editor+app+for+android+download PDF link annotation
    • http://villahetzwartepaard.nl/survey/userfiles/files/73930115082.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/78720464572.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/34572820611.pdfIn PDF document text
    • http://17njl.com/userfiles/files/5882841045.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/49389890153.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/59988237670.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/73917560146.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/2275660958.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/detalabusaj.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/12964065460.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/63890655271.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/28371837390.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/zeturugujugomobitazume.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/28993843906.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/kixamexisezebuz.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zimeku.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wapisiwusidezu.pdfIn PDF document text
    • http://xycrusher.com/d/files/daxetefovuro.pdfIn PDF document text
    • https://iwistw.com/upload/files/pelirogijemugazuvej.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/47264936713.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/mowilomamumitaxoxepejuvo.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/rezojifuxif.pdfIn PDF document text
    • https://halkum.rs/files/15013398426.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 10516 bytes
SHA-256: ff8d890795d5275a143f20d814fdd7b568153ed70020baf25f73b1358d50756e
font_02_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16708 bytes
SHA-256: 88f22d0d500baf6d71f20a415a5ba214964daabbf2cfc25f78b113096f1746e2

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