Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91acdeb0c2ef9a7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 22:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eca8e1526f1a036776fd107dd09904d SHA-1: 74dee39330fe8a237a19269ce9092ae8c0f5b54d SHA-256: d91acdeb0c2ef9a78254b4b4d611218caccde869ac4da526c75b6f3011865680
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting and appear to be part of a link farm. The presence of embedded JavaScript suggests an attempt to execute code, likely to facilitate the download or redirection to malicious content. The overall structure and numerous links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=only+play+store+download+apk PDF link annotation
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/jewigazinafilixe.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55379804114.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/98892713086.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vidunekewijibuli.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/17361957630.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2d54e398---21606900797.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/93045317053.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/58062363425.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/totasebariguzujib.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/wewawozopuwupimeg.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dizirumito.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/xumokafubusoxobodagosowip.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/63510073527.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zexejowe.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/liwito.pdfIn PDF document text
    • https://kultmotor.hu/images/files/siwuzos.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/wapasegazujunolusa.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/mepixowuwakorepu.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/35336981799.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/3029801404.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/kofevojipudululomemi.pdfIn PDF document text
    • https://combrooncom.com/contents/files/mosopudonubikujige.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f805430---43956460840.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fojilenasofuvuzetojapu.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/nixuwe.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_off0000c553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 10612 bytes
SHA-256: 1be426b7c2b79348f6fcfd80ed1665fa56735b9671134fdb6040dfd4242fc403
font_02_sfnt_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 16260 bytes
SHA-256: d8a148d4cfbb603fda50f62df432dd258fbe126ae00d0f503af3e9f38240d6b2