Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcf7612f8300dc8…

MALICIOUS

PDF

76.7 KB Created: 2021-10-05 22:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f37ca2d12736ec15bead62ff9b16e689 SHA-1: e5bfb2b79a6b4481875c78a1c7d01a8268f8f5bf SHA-256: dbcf7612f8300dc8da9ac9fe81b24c5e156d358af1a5932a0122c5e26cc9eeed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or phishing pages. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a deliberate attempt to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sportuna.be/ckfinder/userfiles/files/besazejavudesakumazoke.pdf In PDF document text
    • http://webbuilders.com/files/file/1937051459.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-10-4/20211004053138217808.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lizom.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/96271120363.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/ginimomamiderot.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/vologanugizosena.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/vimedeloxolasafopojodopuf.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/revoberi.pdfIn PDF document text
    • http://qwerty.pl/_data/file/93886879689.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/wozeroxejowep.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/97284539845.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84c783ac5---ridadozinovuvusamo.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/gegudavajagur.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/40456859516.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/wabazivetisilujusu.pdfIn PDF document text
    • https://kueapem.com/contents/files/xirixepilifiledogobel.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/vujonobamititenunarubivad.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/ritisolamovajufapugazapu.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/todoj.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/zamijijobokerekep.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/78701418356.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kosuwuzadosoxafafemam.pdfIn PDF document text
    • https://istanajp.com/contents/files/pevipajew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=electrical+conductivity+of+metals+pdfPDF 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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 17288 bytes
SHA-256: eb7c7a48372440200d3e0fefaba92d2ba22764e2cd320f02123994f4c801bf5d
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 11044 bytes
SHA-256: 6d2b4a5e05660083593c8fc87a96996ac2dc9fcee34cbbde3184730be878f520
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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