Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1edb96b43d53284…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 17:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c139c38cbc7bce1a03f58684121a6087 SHA-1: 7841b0a240b41298f0d1e2131f5b18c3debfd0c2 SHA-256: b1edb96b43d532841104c09eaae9f56008ed8ef9bfa6ee62938b603999a60ae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a tactic to obscure malicious links within a large number of seemingly unrelated URLs. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://podhoru.cz/userfiles/file/38892989164.pdf In PDF document text
    • https://luatsubienhoa.com/upload/ck/files/8885535840.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tilebagufufobetulut.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/40306148767.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/498003618.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/nuropekiratub.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/ruxosuzumujug.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/77500205915.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/1868113665.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/94565335483.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2fa52f41---xajemaguxarezunop.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/23798444450.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/e5f1dghq3q80l11mec1lmbqtvd/83593222841.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/54143686342.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210905233150_842983.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/83764543111.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/95274927966.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/vexibevakif.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bizofozisuvatepevoxola.pdfIn PDF document text
    • https://uangraja.com/contents/files/sepusatifet.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/jasusovinezaxegejanexenum.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/zupolipetuwotukawage.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/84430675534.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/27789785578.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/betuxu.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/bugitax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=friv+subway+surfers+2019PDF link annotation
    • 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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 17212 bytes
SHA-256: 2ca1213d665f6eb87ed3e2a07d612de212978c0f376c15553baea4344affa3f2
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 10784 bytes
SHA-256: 123724f09bf26b77463e9ab1ba561e3392b886ca70c2b92af5d6183fab0f398a