Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c09d647090af89e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-14 10:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8405dc099bb61c86d9790dda2c6ee62 SHA-1: d370a0353899db78319480c800a8546bf2de83cb SHA-256: 1c09d647090af89ed01a54e19414bba560776b375afafe08c682db45990adcce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://desushibar.com/userfiles/file/kowodakax.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/05113ac17a0f259eb98ec75e4bc44d7c/51296021590.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/sinaza.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/64412869642.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/jipopamita.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/23571219494.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2fbb0fcaa---rumunoru.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/nutewiwibifiziwizinalemip.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/bopeponesulularozof.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/zigutisaminanexixuxi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/wibovumajolesisemi.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210910131658.pdfIn PDF document text
    • https://sinarwaja.com/account/files/xumupapepegatipugelojuro.pdfIn PDF document text
    • https://funke.be/data/file/jevowu.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/ragatusozebi.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/dilufedojigavajogik.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/3705105610.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/vomub.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/48847544601.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/58878663631.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/76684334588.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/naxilupupa.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/1147358251.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/81688512111.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/fujamemufonatixodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=la+maldici%C3%B3n+de+hill+house+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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 19412 bytes
SHA-256: fa36cab05d6676b3a5aa5c067fc01c1057b0ae9160140168fde5496359be210f
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 10884 bytes
SHA-256: 4b480f5a204e50d8b8eb5d72b9947317967ec1e1528d638b7a5279921bb91e03
font_02_sfnt_off00013757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1