Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1ee22a95dca21e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 10:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a6c054b6849b7f4d9f4217af6db238a SHA-1: 36fceea5cd0bc5d8b24f9f76a1491f3b03bc251a SHA-256: 2a1ee22a95dca21e0e00a6d65d3828d1e8b66f68ec7dc8476de1967e59fdb594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, including one pointing to 'irlanc.ru', suggesting it's used as a link farm or to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's purpose is to host many links on disposable domains. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://irlanc.ru/uplcv?utm_term=emoji+keyboard+cute+emoticons+gif+stickers+apk PDF link annotation
    • https://artedelvalle.cl/gal/files/file/48108137414.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109170508023282.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/9669764342.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1g363digujkatslomt3unrgh4a/vudoroxe.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/tuvusotadoguxanalatuji.pdfIn PDF document text
    • http://apicn.net/upload/files/67453396082.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/87577882048.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/58198695591.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3e6a2e6---lijokixorelavidugokek.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/demodatokopus.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/godawetedefitobadun.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/kinatibulawonav.pdfIn PDF document text
    • http://avemkz.internet-match.com/upload/files/tuboman.pdfIn PDF document text
    • http://etkenkalip.com/files/10704769161.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/puvevesojejenawef.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zufobutijez.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/90816429997.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/dopizutijiragebunimoxav.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/tipofebinifetemusivuvu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/45558423014.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/74979771413.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://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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 20900 bytes
SHA-256: 7fe0aa56122a1c940d517d400551561318662bb73a78cfdee2a47e8249bb4ac9
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FE 11476 bytes
SHA-256: 6abef432bdceaf7759af03ee56a1660e0403b686eb5d982f74cd6f2e31dd83fb

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