Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccaacfd9f26eb0ba…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 17:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b015f7ae746d3341291bd01a0fd540d SHA-1: c41bb17980994bf29a74870088e1559e53204507 SHA-256: ccaacfd9f26eb0ba4d597b171f67e35112c257b3ab580c1f1a3345ca2287a031
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.grifin.sk/files/pafuxonotot.pdf In PDF document text
    • https://soechi.net/userfiles/file/6812232586.pdfIn PDF document text
    • http://ranch.pl/files/file/48528216997.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365816a1c73---nasununinidutom.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/sonoxogepulupe.pdfIn PDF document text
    • https://sainaudit.mn/File/rowilosajewesakij.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/83563261669.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/dapuwup.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/12182770823.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/fugutokajuba.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/ruwuxupage.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kotizetidiloget.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/62364951953.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/76168454130.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/19966098137.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/binabomixexuzofujoxomakip.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/64744311019.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161482232d6769---63536124953.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210904_4DED45749BC53DED.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/32540748853.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/kewagiwobosigogexuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tiny+tv+free+movies+onlinePDF 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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10356 bytes
SHA-256: 5a4dbb11471558f360ce36f9a4a20d240351fc435213d759937e0b57ffbc38c8
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F41 18384 bytes
SHA-256: ba9ab4dcd1142ba10c7995cd944c6cf468b534ccc134d86178d607f5b2a2e0b5

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