Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96a275d46ef7de1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 16:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 882edd94d180ba1df2d6fc688ccd1b83 SHA-1: b69f4c7c6f6c62c4dcfacf433556ae40d8281c13 SHA-256: f96a275d46ef7de1214d07b7c65b95735ad95f05d340dd84fa3d809d536b410d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which are linked to disposable hosting and appear to be part of a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=darts+of+fury+apk+mod PDF link annotation
    • http://artwatch.ru/userfiles/file/mekevabepis.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/kutizefotibivizoxufogo.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/66879404528.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25413315608.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/40884819365.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4071e7e59b8f8356626149aedf07f153/segapunekonudorem.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315c7ac5866---61544181837.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/zukarepet.pdfIn PDF document text
    • https://fishuntpesca.it/file/konejome.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/fijolirirawepepadez.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/16710555441.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gotukomam.pdfIn PDF document text
    • https://virker-ikke.dk/files/xexediruwaxebej.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/rulenaxaxuwufigapo.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/datotusakof.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/sotabawenilexibuger.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/32118366826.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/kolofupisagazux.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/9600564833.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210916095129_1dsdmg.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/wibubikonijoke.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/tiluruzu.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/74749264245.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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 10592 bytes
SHA-256: 63e9e665af6545b748880e9ceedfa470803683dcc4854597b15ad8dff99db730
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 16112 bytes
SHA-256: 5771b30d9687872e1cca81c3a1be69b742fbb557b482633d195fac77a5dc15d3
font_02_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1