Malicious PDF — malware analysis report

Static analysis result for SHA-256 a394934778288141…

MALICIOUS

PDF

71.1 KB Created: 2021-09-30 10:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 158fe7cf7cc53799aac1b6f6edfdfed5 SHA-1: 3d8dfe218fdf1adeaaee8f8f591d1579df069a45 SHA-256: a394934778288141b59bdc6f2084b1c5c9657db6e601d6ace5c58d4ef548a8f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URL distribution suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=shadow+fight+2+level+99+mod+apk PDF link annotation
    • https://alakharia.com/public_html/userfiles/file/vatupaposuluperixeke.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/72700590940.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/95867378857.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e91ca5ccbcbb5eca7da5a1264d7dc42a/fonomexitoxaxemonetamere.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/lepake.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/vavusupedawixojuk.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/moxozujeb.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/78861830731.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/fivaromomikofobokix.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/betomokamavesa.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/61386265653.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/bujimumozerefot.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615563f7b5bba---72164727821.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/vodurozoto.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/zejedufawurubamikexukozel.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/bufivumawogijo.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/9323226717.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/18142878613.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/xikosavugujun.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xuvojabowodo.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/47892325523.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/22874429335.pdfIn PDF document text
    • http://change4best.ru/upload/file/99803487332.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/26992024515.pdfIn PDF document text
    • 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_off0000b305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB305 16192 bytes
SHA-256: 431ec2a99fe3fede82d038e9a7a86301fd0c1e28bc6cf14bbd6a5b3f0093eaf6
font_01_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 11180 bytes
SHA-256: a1a59c946127c1fb06d1457aa5e6bf7868015111cc08d71f23cc552b2d376bed
font_02_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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