Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ecb14947b90e64…

MALICIOUS

PDF

95.7 KB Created: 2021-09-13 13:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d1b1457d8bc53bcdf5c5af3f4c1d5e0 SHA-1: 7df5e61e737845c9114aa9a971d1b022a0eb25ac SHA-256: f5ecb14947b90e643decfd7400f2169b3d8504553ce39749839ca7afb2040655
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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=fifty+shades+of+grey+full+book+online PDF link annotation
    • http://axwelindia.com/uploads/69275107819.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/94520655313.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83797955460.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/67607120253.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/nuzajifonopidunixovonuw.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/86425680333.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/bidowagupobuvamimugena.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/21488386082.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8f5b5ccc0588cdde60bc7f2015c98e10/sijafijagu.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/81549221590.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/34198425707.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/54133867654.pdfIn PDF document text
    • https://renewone.de/files/golusixanakebiruzedu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613378a955880---wawelokokofokeb.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/88667799982.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/marijulogeginen.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/79376665586.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109100545486947.pdfIn PDF document text
    • http://reopen911.info/media/file/12796877053.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/66937329280.pdfIn PDF document text
    • http://ippon.lv/uploads/File/pokujusosasaxoxim.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kizaxodezetiremar.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/63831304038.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_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 11056 bytes
SHA-256: dd52dffdb79cb3883f579db5c103d9824a7b6c6a45042459aaf652d248e81a6f
font_02_sfnt_off00013f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3B 19152 bytes
SHA-256: 773ef5ffd8eca2b5b9e0e5ec3d743ca889c038d93e632d53684ebd35689f70fe

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