Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed7de26a54f6a60…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 11:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5940bc37e66db6fd1e560aba35cc0c5c SHA-1: e3dec733c1143d38ac5d8f8570313cce43e29847 SHA-256: bed7de26a54f6a604c96cf5191a742eedf3aa0176f7b39ce1c776064d0481a52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=ios+vs+android+revenue PDF link annotation
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/wanibawesorivubedix.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/28229770564.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/fokexinazufewanozaba.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/rogejozatiwanivim.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/sonixuzaxolomazekojixu.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/47163936171.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/16475793550.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/dominiwazumoxezizaxujefot.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530bfe39ef---3642446303.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/rimubadavamaxuzivase.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/18904090222.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/37951677866.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kunof.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/wijutavegibupazijiramo.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/8192106527.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/nafinekazojotojilosonu.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/zutubijifa.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/10242231077.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/50088659618.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210922123146021051pcbdg.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/26012201328.pdfIn PDF document text
    • https://oferta.lt/i/File/66164250568.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/potupire.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_off0000b03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03D 10212 bytes
SHA-256: cc115c2c03fddf721d5eaf5f972d792a72257d3d936692ac6044c730006bf744
font_01_sfnt_off0000c743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 15680 bytes
SHA-256: 1aee80c3d53e7eec6f7e4bf9e30f03618845c53d0bf7df6af4719172ed802705