Malicious PDF — malware analysis report

Static analysis result for SHA-256 433356561883a3ca…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 14:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc8356bb9d9288176461ebb0b6cb63a3 SHA-1: c7fc965dd1e677bc191517873a617d6c59cc0302 SHA-256: 433356561883a3cac002c47ef6a887259b6f7d33746b3a4c8ed43da92960c4c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating the document's purpose is to redirect users through multiple sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pasarangroup2.com/contents/files/35364542352.pdf In PDF document text
    • https://aspirans.com/files/file/pujaxowib.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/jonafi.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zimugutubisozex.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26561355944.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tujikeduzojefajudan.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/54388638899.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/tunanetazuwaxid.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/vuzilusewazufakewasora.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbf3a60db2---baxurojivavovotegolu.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/94433755985.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111101155478.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/20149465784.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/tetelojedivevi.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/26756244397.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/govukexaxubedominisi.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/51935811858.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/gudibisumadetogelo.pdfIn PDF document text
    • https://tsegypt.com/file/gidusilijivemusewonubef.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630542123.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/bupexinigokosesigom.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/nokit.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pubexorif.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/73892625376.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/sazafuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bahl+and+bahl+book+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/besatoredepilu.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_off0000bfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAE 10288 bytes
SHA-256: 35433c257658006dbcb488a76e83dcca273dfec464a40c3eb6e3d33912a04a4d
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 18012 bytes
SHA-256: 955d09c3cc92e076a5d7e1e3dfe34d495e95ddc50c7003212d0411da3f47097d
font_02_sfnt_off00010528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1