Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba6ae005bb8e8fa…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 20:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ada0d3b1a9e902c93397b196e05cc795 SHA-1: 13246793e380ad0d9c72c8e9c5ddd46f829c1b27 SHA-256: eba6ae005bb8e8fa26ba32911ab96229ed7f7545b6b86e74bbf521418b248ed1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=otg+endoscope+app PDF link annotation
    • http://musthighschool.mn/ckfinder/userfiles/files/9424594673.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nobigigive.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/4560236682.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/21497473563.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/koxobedubokolukozo.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/10985026457.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/finowofirorajodanipo.pdfIn PDF document text
    • https://tcremich.lu/files/files/fumutedopipofepevabeve.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/85999723409.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/17958927162.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/51660624056.pdfIn PDF document text
    • http://fullx.net/files/dokujejixe.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_8BBB4A0D9E4CB8BF.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0c5ba08---74102772509.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/koximunuj.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/91686142455.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1dde6d4b4---rakax.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/8384727828.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/74480735908.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/xunizufinisoziliwubid.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/51936860674.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/bovimifuditonewes.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109062224015421.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/tojebibafonivop.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/76232729670.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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10476 bytes
SHA-256: a40a2d4e92790940fe1f15b6dcae17568f9e1e23c9a385a64b171a04fdeb9a74
font_02_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 17696 bytes
SHA-256: 2a9ba11d5120c5a91ff528d908a54724b90768f94b22d48870a31ba8439bfde4