Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e81b82dd6fbcb4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 01:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8c2ccbaf903ed5ce558f5b5aa216835 SHA-1: b81f1e41b0e4049d7ad33f75a79142f918496df5 SHA-256: 24e81b82dd6fbcb46b72e926324aa69567a56224c5d20229daa5d45c4486bb6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of external links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=gradle+debug+plugin PDF link annotation
    • http://saigondome.com/uploads/userfiles/file/13909224029.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/lezareved.pdfIn PDF document text
    • https://tckontrola.hr/files/furoduvejijuwu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/vesinogil.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/zutiwirefinagezejudaditu.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/zazazidojunuxamisodi.pdfIn PDF document text
    • https://go2germany.ru/files/file/99765764373.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/kadijeb.pdfIn PDF document text
    • http://abpaluso.com/upload/file/letisox.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/29635005629.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/81532799063.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/malorezop.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/mazutumuxilo.pdfIn PDF document text
    • http://land89.com/ckupload/files/vovunujedisoporemujig.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/86905165563.pdfIn PDF document text
    • http://annabarons.com/files/files/sojoro.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/buvifaj.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/36228711562.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/28717567635.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/nudowaloperotatab.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614a17068f249---37816531508.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401f1288dee---58263985272.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/23169477071.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/17787725368.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_off0000b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 16592 bytes
SHA-256: 092f837ce78db95b8c3d477c0397a80242fa62de526d4830fde555e0590623aa
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 10460 bytes
SHA-256: f4f1ef8a67b5468fdcd3d01829cbbdf42b38a888678025247fdc135ca56fd9ed

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