Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b54b07224cf55c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 21:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dfcf98d2da6f7930ace309d2fd489db7 SHA-1: 2d981d4e9e4a9809f08bc0a3131528864b1e4cab SHA-256: b3b54b07224cf55c4d1360620496e221b26d00f31675d677b495d7fdefae82b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to 'coretry.ru', suggests a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=summoners+era+heroes PDF link annotation
    • http://qunjl.com/userfiles/files/58799729144.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911141434.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/sawekepofegijekizevojuken.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210923/file/balugi.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/legesaxowidiru.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/kesudowalosezi.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/26714713255.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/wekovalovepubivojiwigobir.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/ravajosijemijojerati.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109121532069465.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/wilisuguwusozazuj.pdfIn PDF document text
    • http://nemalipics.com/93130043768.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/deviginotarusewipovexi.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/wakedikokoriloxet.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/gexifevowubugowezebepasad.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/14661291376.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/miborizofivaxafidopika.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/45098654686.pdfIn PDF document text
    • https://udruga-invalida.hr/files/84117036327.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/890550656.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/toviwofubo.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabasukol.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/tukunurazuvavipop.pdfIn PDF document text
    • https://le27.fr/docs/file/45059245670.pdfIn PDF document text
    • http://harlit.com/upfiles/file/39555352754In 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_off0000afd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD1 16768 bytes
SHA-256: 5097bd8e30069971a453a20a809d11c42591ee81babf1badd2ebce13b552223a
font_01_sfnt_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 10312 bytes
SHA-256: d39f66c336e2a66f59d45ddf1fdca7e508f32a135b49cfff6632b73e0da16f1a

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