Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc35db0922ac849…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3bc3b25286dafe975cb5ea33f1b37fd SHA-1: fee5233d0a9a9d567732707a7d213979f80088a2 SHA-256: afc35db0922ac8494e8988d1a95e1d6ecf276acbcf1a80337c7e0ea50ac96f76
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-based lure, typical of phishing campaigns, to obscure clickable links. Heuristics indicate it functions as a link farm on disposable hosting, aiming to redirect users to various unknown URLs. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest an intent to facilitate malicious redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://architettosbaffo.com/userfiles/files/20569001751.pdf In PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/sududix.pdfIn PDF document text
    • https://penal-garazh.ru/files/80155491409.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/letotijoferugiz.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/27609000415.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/tufovipevobojeravatidetam.pdfIn PDF document text
    • http://saowaneecamp.com/UserFiles/file/42724939891.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/tuxorivi.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/babonadapose.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/66995671590.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/26255586567.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/jejodakorizozebudi.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/fafukuxaxavufavasavoxofe.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/boxanud.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/pemuzatajanulunodupokexub.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/basakuraparibakedobufibes.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/93476617287.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/47041112060.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ad35cfad---nemojijuguxudalade.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/soburepevukevi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/xidemafukimokorufos.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/70868513695.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/11764099906.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/94866786642.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fomidaxapesudojewi.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109211221325946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=get+ip+address+android+studioPDF 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_off0000b089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB089 14188 bytes
SHA-256: a9b2f84df00e344772dafd433f24e53c93aadac91b6b3adeb2cdb8eb53699608
font_01_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFF 10480 bytes
SHA-256: 88986f093e62e0adfbc58f57482339fc9234e2295e1d23b59c3496d43184baf1