Malicious PDF — malware analysis report

Static analysis result for SHA-256 672802aae412f732…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 10:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5b844377b4980ceceea8f80b91ac40d SHA-1: 1927e3dce843578593078aa17486f5f0f75a8e85 SHA-256: 672802aae412f7326a987d15f827322d9ff4cf459bc00917959170a3792bd51c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains or are part of link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=among+us+thanos+mod+download PDF link annotation
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/42903832678.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/44536353376.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vizajutulipajojanul.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/7469213098.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109010031028512.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/mozenogegukizivapalug.pdfIn PDF document text
    • http://specimport.by/files/files/gatefijatatebowujiz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/zimirema.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/detabulopunupiv.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/dijegefafov.pdfIn PDF document text
    • https://scalper.ir/data/files/file/muxidipagegarud.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/91853378611.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kagewujuragudetizomamos.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902162737693.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/2708593992.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161360f16b0a6d---potipedupivojofedunexix.pdfIn PDF document text
    • https://masukpt1.com/contents/files/2463174280.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/91853075958.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/dukobufazagagebebix.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/rifetisinofiwife.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b0994ccfa---kopepunopakinodu.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/37927782100.pdfIn PDF document text
    • 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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 10536 bytes
SHA-256: 5a171fa2d6dd91a6e70e1513b8a61b5f4a9a3d28718a9a1de6b1a534ae5d3be9
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 20316 bytes
SHA-256: 7cbbdd4ac01fa06633f3be636f1ec3d90996c04377fac4e7a20a84567d554d6d
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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