Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef7a36166b12730…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 12:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 263fa17475414a64160da6aff8523507 SHA-1: 5f7a22acf0c676336085da3611b2cdab3d145395 SHA-256: 9ef7a36166b127303c3378acc51fcf75469ae715e72838e514e23cf2f8448afb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using multiple low-reputation hosts. While no scripts were explicitly extracted, the nature of the embedded URLs suggests the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=war+simulation+games+android PDF link annotation
    • http://ahkjt.com/upfile/file/logokavafelewajulemulev.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/pilaxemit.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/pefugubosetuz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8796692c8---penim.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/84032709806.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/44794794989.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/20115903997.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/14729948539.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mofavopuxufarev.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/zofatodoxevajus.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/54438870502.pdfIn PDF document text
    • https://datawire.gr/files/files/90029332660.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/38564901636.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/riwomateka.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/47150613707.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210901062601.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/35080085968.pdfIn PDF document text
    • https://polaria.cz/images/file/4590722442.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/97434130234.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/94637353073.pdfIn PDF document text
    • http://abc-tel.ru/data/File/lowido.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/wavabebevugo.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/26804575154.pdfIn PDF document text
    • http://deforma.it/userfiles/files/weparasi.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nabetanegigujanubu.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/4592796248.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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16732 bytes
SHA-256: d363b07519395f465550d5d1f798c34742afc1d04caf5cdfc46c8220c8f5f558
font_01_sfnt_off00011480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 10684 bytes
SHA-256: ec9d09c05b309b7e07e0143bd773fc14920aea475a6f16c2c35c6f26de7b4ee7