Malicious PDF — malware analysis report

Static analysis result for SHA-256 835302d3ff9b22eb…

MALICIOUS

PDF

85.4 KB Created: 2021-09-20 15:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a8fab8f1d95388f16a31efb4a0c3dd3 SHA-1: c9d29061533fc6385163baa0166d84070e316b03 SHA-256: 835302d3ff9b22eb41cd4649729d4c86a795e14389c0ec645ccab13ed70b6b98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or SEO-based distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://salamatekhanevadeh.ir/ckeditor/files/files/loxilefumesibepimovuwu.pdf In PDF document text
    • http://we-women.de/default/files/uploads/file/lelesurisugugake.pdfIn PDF document text
    • http://namngonviet.com/user-/files/53613131575.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/ranasubomibapezadir.pdfIn PDF document text
    • http://flexa.cz/docs/file/wukeriziwexetileni.pdfIn PDF document text
    • https://777mto.com/contents/files/52212739500.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/rimejojafebig.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/boxiwipipuxobujut.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/pubofefaxovasesimuwufegi.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/34796694645.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/93183342464.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/47546591019.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f181e7a8379927d666ef5edccc86dbca/joxora.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fabefijidafewagik.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/46886338819.pdfIn PDF document text
    • http://www.heksan.com.pl/file/vuregivibirawajoxu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/78227107403.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/89691123898.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xeridobokafavurug.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/pinoderexugizexinij.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/67962047455.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/6774489156.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/69329086931.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/vaguniwadowarejakiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=modelo+de+las+5+fuerzas+de+porter+pdfPDF 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_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 18196 bytes
SHA-256: 27e4fc5cc9bc118807f3163322bb63d0590f20f92cc76e9807e12ad28198733e
font_01_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10584 bytes
SHA-256: 5ca001230d772fb10cd24a61048c29617785f86c17786e6bb7f8015af5ee489b
font_02_sfnt_off00012f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1