Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c11667d1b340e7…

MALICIOUS

PDF

79.5 KB Created: 2021-10-05 05:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: be3c50eb7e01f528a6811c13f9794b87 SHA-1: 251d4c5928a26c0fe9429e1be868cead5426f990 SHA-256: b9c11667d1b340e7d13a7ea8cb9223bd5423ed1c94515172f08c01f577dba557
134 Risk Score

Malware Insights

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

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 to external PDF files, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a lure-based attack pattern. The primary goal appears to be directing users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://tanriovermensucat.com/uploads/genel/files/54525294481.pdf In PDF document text
    • http://rotang.net/userfiles/file/82443169891.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/tipuredupabeven.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/35289189669.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/savavona.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wirilekuxuxiz.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/labeganunawulakugeremoki.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/95851405860.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/54236051978.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/26939402169.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/jodibeb.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bec272986a---zebumakigosoxipafom.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/kozaxowolijigoma.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/zalejipidi.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021100404371894.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/63841858227.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/funulalavimux.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/sorimimipuxuzalopidilu.pdfIn PDF document text
    • http://gestioniarmatoriali.it/22129244699.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/10848132938.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/wozipepobaniluxigozul.pdfIn PDF document text
    • https://eventaipei.com/upload/files/79980451450.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/rajet.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/76522443639.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613285a15eaf5---6952917131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=eamcet+maths+question+papers+with+solutionsPDF 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_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 17572 bytes
SHA-256: a8ca23abde192bac4457178bbbd8702c2e582e03af376518fe7512f3cb6aea74
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 10952 bytes
SHA-256: 4dc3453cd6b6fad05132fbf8b0555106675cd07021abdf186bc86f28565aa392