Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a5739ba5f0a025…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 21:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 188b2a9f77c33e53d1ddd670870f45b2 SHA-1: 8e60ab5e8fcc6f563e761ef751999a0b734e6a3e SHA-256: 07a5739ba5f0a02545fd5ac2dd509cb4e39e6284e0f3b1f95f33189fffa504fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates the PDF acts as a link farm, embedding a large number of URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://uleiuri.ro/userfiles/file/27413246692.pdf In PDF document text
    • http://st-ark.it/userfiles/files/77153543867.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/87909609084.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/62946753673.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/2894099988.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/mapifixilol.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dozufijuvejutepudujitox.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/dubogivejogogarivo.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/koselinewisavivuges.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4c8808674621bdb45fa58d38fb819c59/36645727752.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dojesibez.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210908_90F07BD30604C957.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/74131556065.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/75690135338.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b537dc12c---piwujixojusobaxofenojev.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/sanuxa.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109112304553823.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/xilawuzeruvofenabeje.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/39760475263.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/lewotitevufonuki.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/73599334311.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/16488732975.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/68023403514.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/84194759042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=el+pasado+indigena+alfredo+lopez+austin+pdfPDF 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 10816 bytes
SHA-256: 28d67240f343a195b7119e7e81913df895813403237a7363ee51acfed181b2ca
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 18160 bytes
SHA-256: e3814ba7b28373a2b8cb71ade0ba9c2bd659fdb73737c405068a0f84cd57c259