Malicious PDF — malware analysis report

Static analysis result for SHA-256 9706f68fb8eca832…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 10:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c3bdc329748e433dc20099d6cc14f67b SHA-1: 353dce76b2bc07fbf320a14a9b9ae64f48b291a8 SHA-256: 9706f68fb8eca832a164c7afcdf64076290e7e1a5a98751fdeb2ae730182d62a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=manual+focus+video+android PDF link annotation
    • http://eubeer.vn/uploads/files/57203358279.pdfIn PDF document text
    • http://beiks.info/public/file/8830168412.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/16196236626.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/48079610370.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/44062385406.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105313200908.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/forufagonupizovuvojuvu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf2ce2dac---saxojobujote.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/jetepulobixifofevojulu.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/batogepanorile.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/52675193148.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/vulafagipizuvedur.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/jutupufakolowosonawajufej.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jexunekugoxa.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/84902165154.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/40875123618.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/1582976519.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/3609537237.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/luzebuxasefakoja.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/445b5ee270da88044471731d5306ff93/vamusototimijikeli.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/fotikovujivijanujo.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/80494442191.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/49971362558.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_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 10532 bytes
SHA-256: 21447ebcc571e3d7c9c6fb32d4fec75e63b4d2dcdb3a39f302a44edcf1e0f6ee
font_01_sfnt_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 17264 bytes
SHA-256: 0a1e6870c1ce814619fdb2e9eb89e4eb69e88fd032c3941303d2f49629124776
font_02_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1