Malicious PDF — malware analysis report

Static analysis result for SHA-256 71264fb47f327abf…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 17:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba40ff70cb096f1bb7f588e778b09941 SHA-1: f7111d193c21c6a43c8e8bbda2af544fdb4651cc SHA-256: 71264fb47f327abfbc7356c9a20963c898b24cfb219c526351b749f76c0aa814
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and a small file size. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the redirection of users to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 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://nt-module.ru/ckfinder/userfiles/files/66496397376.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vowiluxepegitomuvisezo.pdfIn PDF document text
    • http://reylab.com/userfiles/file/demonulevukiseramivop.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/ninaba.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091101462873499.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/vidusiwakij.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/tabeno.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/39797829704.pdfIn PDF document text
    • http://jngf.cn/files/file/benuwobadoze.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/38410680249.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/91909571536.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sifebuko.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/ninigola.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/nubodadoxag.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/wufewofazazijetujo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98981c2b---zilifekobuni.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/82845594255.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lovixitowipufi.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/83772455036.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/zajififuvidew.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/75547142107.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/libibezavapetonizabitav.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/xateniropivurene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wcc2+60mb+mod+apk+downloadPDF 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_off0000b103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB103 10804 bytes
SHA-256: ee3191ee9abfaf4ffdd71f31c723ba3b385dedc5f4234590f116d1710c300ec7
font_01_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 14360 bytes
SHA-256: b375f51a5cedbf5dfa74735c225ea2ee19714e1bc776a2309ae440671fa93572
font_02_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1