Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7828cb0364f63f9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41fe9bb03eba8a7072b5cc14934672df SHA-1: ecc723d80c8a7c63b56dcf6d034753ebfc91885f SHA-256: a7828cb0364f63f9916475dcd2e6714cc1c9576ccdb2605dd32ae33952aeeabc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c873b3089b---66448247367.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/goledej.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f74309d4b7---47639718956.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/xeduwibevuja.pdfIn PDF document text
    • https://bdata.vn/upload/files/zirur.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/16726321182.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///90790247604.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/sokugisubogofogumi.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/83040824399.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/tevipaxivolefebutirijot.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/666975792.pdfIn PDF document text
    • http://vaithun.net/upload/files/85129367563.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/letetuv.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/baxabufamap.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dapuxejitopadobu.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/vegorozu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/wejesojerire.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/xogemufepezutonimogetiko.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/zobogawofodejikugog.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/76259002599.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/parilewoxefalowozar.pdfIn PDF document text
    • http://3sdent.com/upload/files/dulagesepupazixif.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/nevidum.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/64023112632.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/67361716425.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/76090940688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=paper+recipe+in+minecraftPDF 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_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A11 10308 bytes
SHA-256: 27acb2d0bd71b1a7b89cf721a48ec73fbb3744dce337f9588b239e8525bdaee9
font_02_sfnt_off00012141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 19376 bytes
SHA-256: 15ea660dab161ba2c2c98206f4e8a02b75fef9ebaa94a62de654816991f3cf2f