Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee6fbcbe56009f1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-10 15:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 006c56588f47921d55a5f934caddfec8 SHA-1: 8bd1d181a54fca49184d2739a2da61b8730d13d1 SHA-256: cee6fbcbe56009f13f7ac2d12239d2ddfdcd06efbc3a7b2a3237bba0d3862c71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/samitugiri.pdf In PDF document text
    • https://shirbandifelt.com/userfiles/file/54132365121.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/4235244729.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/kefuroxumi.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/nalapelomasudobixafuvipev.pdfIn PDF document text
    • http://bastola.org/userfiles/file/61283038608.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a860c342---kudokevuxu.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/dewofuvoziwosotusigu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/88046530055.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/33342927169.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vipok.pdfIn PDF document text
    • http://szm.hu/userfiles/file/xugudizopama.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021802216788.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/konutasalav.pdfIn PDF document text
    • http://skncn.com/u/files/ropanurotapem.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/43045dd60cb1eff3b93d6970156e4bd6/76964613757.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/79318975064.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/71399090056.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210908133711.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/18095256635.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/51730994736.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/mixexovatipixujiwo.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/vanudoxaxuseledape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=adventure+capitalist+gold+cheat+enginePDF 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_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 15724 bytes
SHA-256: ed8b940dba244134c0ff26a691dd974df0df310a6aba1028cfbee488f5e2272f
font_01_sfnt_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10940 bytes
SHA-256: c5b362beda1a7e7eceed33e24576b0853c5484149092d7c55355687d8a762066