Malicious PDF — malware analysis report

Static analysis result for SHA-256 32eeb45a49eddb60…

MALICIOUS

PDF

71.9 KB Created: 2021-09-10 17:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b36b01ec2be5d033ba6e1f6edb82adc0 SHA-1: 515ee30dd673112abd1e4713116e943b6d566111 SHA-256: 32eeb45a49eddb60583f39134dbf3fccb9a1bf0402c230ac21864e00a1fb2d15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 https://100tmt.com/uploadimage/files/20210905131356.pdf In PDF document text
    • http://changjiujz.com/uploads/files/202109082125518996.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/dumonuxerime.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/138944395.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/39955218471.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/98383508102.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/lojuzat.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/gafetofon.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wezivozawafajar.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/jemabozezubonugise.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/27916803857.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/58881875177.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161332094bf9f3---bigedibuviwinuv.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/navuwog.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379c11423e4.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/74524618429.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/vazazukuzebama.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061158420341.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/lozatopemapewojunapite.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/29414837897.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/63587004130.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wefumatogaju.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/juguwepokek.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/lerefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=email+validation+example+in+androidPDF 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_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 16472 bytes
SHA-256: 62fdcf74da83102ff7e2af1366098f8fa3216861af19f8f03629b95776de569b
font_01_sfnt_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 10536 bytes
SHA-256: 602277f20a96ccaca03c127f7cc41eac89dd2aadf6d92d08e4ba8ac0d308bc6d

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