Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5a0a98a4498aee…

MALICIOUS

PDF

95.5 KB Created: 2021-09-16 03:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba048e7232e14b75a4c48a6ea5533e11 SHA-1: f255a23645ed9613a0f0d785fa4cc6ea968dc7b0 SHA-256: 5b5a0a98a4498aee841df95d935984e2165cfe0f8dada5b52fbc88390d0dea2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of an advance-fee scam. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://livbiopharma.com/userfiles/file/vobiputexisotudelopuzuxux.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f25d6f785ca35534aa8f5ea73268567e/61099792798.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/jedenuzumu.pdf
    • http://haciogullari.com/depo/sayfaresim/file/roxejomeperibajeketodevi.pdf
    • http://ytlcases.com/userfiles/file/98327921348.pdf
    • https://martas.vodrsport.cz/uploads/files/90801897742.pdf
    • https://mbzgogo.xyz/web/img/podborky/files/59200408516.pdf
    • https://perkunasstudio.com/uploads/files/202109021533505998.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210913072139.pdf
    • http://placc.info/up_image/piwuviliriranunojuj.pdf
    • http://defhjdr.friend-match.com/upload/files/82817229897.pdf
    • https://thaiwoodengames.com/files/upload/files/19133440118.pdf
    • http://ubytovani-budejovice.cz/picture/vtextu/file/90915858780.pdf
    • https://icrs-as.com/userfiles/file/nuxog.pdf
    • http://chothuexehochiminh.com/userfiles/file/kufega.pdf
    • http://diencongnghiepvohoang.com/uploads/files/5237718167.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/63074939352.pdf
    • https://es21sys.com/userfiles/file/buxoxowevigewaralexim.pdf
    • https://sonerofset.com/userfiles/file/nogiluxesik.pdf
    • http://szhlfz.net/upload/waxojofen.pdf
    • http://daejonggyoyc.com/userfiles/file/20210913092910.pdf
    • http://xsjsbzrw.com/uploads/files/dokanasuludike.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/44631147422.pdf
    • http://sinproval.it/userfiles/files/77668331450.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fifa+15+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ba.bin
59bb7baa367d0208c12c50a4469603fc5a0e5d4b63565463468e162938469479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 18864 bytes
font_01_sfnt_off000142c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142C4 16792 bytes
font_02_sfnt_off00015ada.bin
441ee8d377be226d615cb11bde7c7700dc55f10c383af12ba394f08bdd2f522c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADA 9920 bytes

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