Malicious PDF — malware analysis report

Static analysis result for SHA-256 547bc650cc84720a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-08 14:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 479ac87fea0f917b477aa8015820bd90 SHA-1: 7b38c866390437d6ecad8ddd236389b4d8cddd91 SHA-256: 547bc650cc84720a9844f2d0ca7141319559cd3f48a5932810bc1ecf8936311d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, likely for SEO poisoning or to redirect users to malicious content. The file's structure and the presence of many unknown URLs suggest it is part of a campaign to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://univerosg.com/ckfinder/userfiles/files/88181901634.pdf In PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/80474755899.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/devipul.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/39997186806.pdfIn PDF document text
    • http://lex.tj/img/file/74577818936.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/kinetofugawonezoxa.pdfIn PDF document text
    • http://emannsltd.com/userfiles/fokerivu.pdfIn PDF document text
    • https://la-klamm.org/Files/files/sagupezobuvokanano.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/zurewigesubilenijumamexi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/527b5c178b807b21ff2f1f5de51f0c88/raberogejoloxenumupo.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/gidaxibomewetemixi.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/tisonupigal.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/pinelitigo.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/togunusetawi.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/kumafatodupeboxire.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vidinidewatemejibu.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/luxosovekikidu.pdfIn PDF document text
    • http://kahasat.cz/data/file/guzumijoxoruposopotax.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/xopumamarupugonodude.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/sogukatofuj.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/zisutelenaripepilemetiv.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mofepoxusat.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/77518873580.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/5842071711.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/kezikuparujogivewusun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=steel+structures+design+and+behavior+4th+edition+solution+manual+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_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 11524 bytes
SHA-256: 2851ffc10b81823dc439ed4a84f303c34a3b1b7612eaedfc10abead1932be0de
font_01_sfnt_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 14504 bytes
SHA-256: 98104018308d2d57bc8b99da62f5122285cb15acc45244a59cb48e66d68f1b90