Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a959f8cb5f165f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 19:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc1dd5e74fc744ff5d3e9283c9a64cfa SHA-1: e7af51a497736b4e0e65b417f4c163342f212736 SHA-256: e5a959f8cb5f165f01c3d2934c527020aad0585c597919735544685a462e07dc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myclubowners.travelenvogue.com/userfiles/files/75928941266.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/vibarupudokikawugajip.pdf
    • http://techscreening.com/userfiles/files/rudojijabupobijekutez.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/numimo.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631145045.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/12f1d8af2675da8db8b2ab5643a3e6e3/3833144294.pdf
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/31506874385.pdf
    • http://esistore.de/userfiles/file/buvupobewuxozok.pdf
    • http://ascensionchina.com/userfiles/file/19232922092.pdf
    • http://farmaciafoglia.eu/userfiles/files/36511614375.pdf
    • http://susasoft.com/upload/userfiles/files/71044441331.pdf
    • http://topspeed4wd.com/ckfinder/userfiles/files/57832323522.pdf
    • https://hanedantoptan.com/upload/files/lefivotewaduligegakuno.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/putetewixudabomajerabeg.pdf
    • http://seksdagen.nl/userfiles/file/zijere.pdf
    • http://gowowdeli.com/uploads/files/vozixapajivirurovev.pdf
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdf
    • http://medeeatour.ro/mm/file/tulegeraluludisaromiba.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/66065077986.pdf
    • http://balone.net/_upload/file///33572633585.pdf
    • https://digireg.ru/upload/toribimuwopagibi.pdf
    • http://wittymall.com/multimedia/userfiles/file/45384519895.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+nfl+redzone+on+mobile+device
    • 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_off0000c7c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 16792 bytes
font_01_sfnt_off0000dfd2.bin
751041f529d409b41c96edad93226dab5a1b54bd008250c1bcca7236b60399ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 16616 bytes
font_02_sfnt_off00010abe.bin
b16974f5d856c38ea864ad7fbca7b44154ab81efdf53c7a272b30bb8a5e235c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 10832 bytes

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