Malicious PDF — malware analysis report

Static analysis result for SHA-256 f188ad44808a4f26…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 23:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ead9ab1f927142b916399a0578887744 SHA-1: 0d1bbd2c0a93dbfee89cb8378d0a189ddf4e92de SHA-256: f188ad44808a4f26dea5d8065d723cf4ae8baa2f34be2516bbc6125e2845ac89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links to PDF files hosted on various domains, coupled with a heuristic indicating a link farm and a 'download button' lure, suggests a phishing or social engineering attack. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure points to a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://altaitur.com/ckfinder/userfiles/files/92608402165.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d88f356f3---34128727837.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/marupulekika.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/22488033851.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/winuwizitekiwak.pdfIn PDF document text
    • http://df-2.de/images/daten/file/sevabipukotatozuvefige.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210904054821.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/zawuberizugelisilijifi.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/valiromarekewogo.pdfIn PDF document text
    • http://zxsolar.com/d/files/23007372493.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82472034151.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/fopezoxigapanokugijim.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/sijafemijolupafijagajun.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/79409746510.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/11105895225.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/29545005120.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/6886201123.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/bivimupifi.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/pidizavonudeberekunakexe.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/34846651122.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/mobunoxuwi.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/15065721884.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/alv16vfr01l46o28ddmbrg2vu0/2277941558.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/ligojugonagaja.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/13838107196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apk+download+for+smart+tvPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10660 bytes
SHA-256: d64740a1ce0340b394375bfae14e89b6bc107979db344eec58474fb61f004c2b
font_02_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 18164 bytes
SHA-256: c0b49cca21703a9d48cbc044779ea131c75e7ad5f9d92eaf82d73369d39c6686