Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d6ea3b51f03296…

MALICIOUS

PDF

73.7 KB Created: 2021-09-12 05:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 118974fec0cada83aa2b2756e781f618 SHA-1: dec54d8746bfef0f48c0d48ae3b0fedf57d04326 SHA-256: b7d6ea3b51f032969a9bf658ae81ff93965103ea772fe7af29a39d4bf20e8309
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://giaphatmed.com/upload/file/nozipure.pdf In PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090212260088141.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091207043270554.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/16560286009.pdfIn PDF document text
    • https://cian.hr/userfiles/file/birolotefafubuzeg.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/48972348069.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090703511580554.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/23311599867.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/zevotawokeje.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a02e5cf7---14995924044.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb886db7d5---42746976745.pdfIn PDF document text
    • http://lulanjina.net/upload/files/zetorudajimumubogotuvokid.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/75373965956.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/59134253199.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37738930359.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/51232389592.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/42690311831.pdfIn PDF document text
    • http://hejia-ele.net/upload/pakoma.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/gogoribavidipakirabi.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/xemopigolopedune.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/86504315525.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gikulenuko.pdfIn PDF document text
    • https://zzhqhi.com/d/files/70776126824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=korean+tv+series+download+appPDF 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_off0000bf66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF66 16308 bytes
SHA-256: ede300df1c0aa2fd2b1bea01097bb5d1914f6cb7a1aa62b44e06613c0486993d
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 10528 bytes
SHA-256: 148ac790a61d38a89cfa158d88a7e64b163a3c81eace3d2be7964faeeb7bc555

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