Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3249a662a4a75e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 00:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 676bb15898e9e12c62dc0bf29d2b57f2 SHA-1: db5928e10ee150f5fcc7bd65a8fe76329dcab6f0 SHA-256: 3f3249a662a4a75eb0a26c2da8786d52f543de6ee419a57953990dd3ed45cf1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laplacedesstores.com/upload/file/tobukikipuvatexofo.pdf In PDF document text
    • http://emannsltd.com/userfiles/leximunubetojuvujuduxobev.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/lewaladoxe.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/lenetuvoxij.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/49576475509.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/gunomivaribonibudunuj.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/kifomopowibakivakemijofi.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/nedexuvemakasugut.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/mokadujesedazaruk.pdfIn PDF document text
    • https://virker-ikke.dk/files/50545043578.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109130814128641.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/dunenuda.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j9qpc58av73fi4ho0sa7m4q311/10559615338.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109152333456696.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16305842760dcd2ade339a3d7ce132.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/guzeti.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351e405dead---38221169533.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/68051623460.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/vovizidezoluvilifozili.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/mijojixepowilexuxebab.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/jujaxamirodidagerejogono.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/70818598467.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/xizilakavigujatugipemivu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/rinelafuzituk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=suite+life+on+deck+full+episodes+online+freePDF 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 10716 bytes
SHA-256: 1860b41e5a506041758905eb510468e682845acdcf405c06be85d3256416ab53
font_01_sfnt_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 16840 bytes
SHA-256: de7c48ffb777106125036e76296e0ca5f5ecc4a6e3a82e973ff2b67347b2bb8c