Malicious PDF — malware analysis report

Static analysis result for SHA-256 18feecba5217d067…

MALICIOUS

PDF

73.1 KB Created: 2021-10-09 21:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe2c7dfc5b6c0e474157b806eaa582fd SHA-1: 677f55e4682937aaed4e89820058218faf4a877f SHA-256: 18feecba5217d0670beb625c83275fe1bd985d6262d66242c2144db4489c54e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as a link farm on disposable hosting. This suggests a phishing or redirection scheme to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.truca-taoules.com/ckfinder/userfiles/files/54963864215.pdf In PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/vufegabegotujudebezad.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jd1afbkbhdcavvonago3btubm5/42950778325.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wibasefomu.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/veguzures.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210908_030915.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/96449603693.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/gitatafizepe.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/70481544912.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/43854948975.pdfIn PDF document text
    • http://hotechike.com/files/files/jamevisibibalesajowol.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/rozadazuvijijuresopakeku.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/mazinimedaguwesubebapap.pdfIn PDF document text
    • http://yongqingtech.com/d/files/lufefebikutexazibijasuka.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912184355381.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/62190696418.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5273bc6ea47b47a44541806a745aa377/golavofi.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109071350393760.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/gavepenaregawijes.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/97777047008.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/60472361621.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/88946478754.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/bamugosoxuwa.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/73875082806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=enzymes+and+cellular+regulation+answer+keyPDF 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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 17064 bytes
SHA-256: e5c76e13c29f0663c54639fa6fed234655cd7ffc1be11a3392d620d3e97bcb30
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 11148 bytes
SHA-256: 03cd30d909705b742d78aa0f0d29e89c8c25ba6890fa5a10d9402c74cf3c5225

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