Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adaaaa95801596b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-14 12:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16b120431140674306a614f6383eb268 SHA-1: 3447a7f53386d80960d9f0879d86574b48b4211f SHA-256: 4adaaaa95801596b47e0af222a66c73f198433a91e89c12ae8905cb71e22c058
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or credential harvesting attempt, or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://portamarioarchitetto.eu/userfiles/files/44393961351.pdf In PDF document text
    • http://kenhuffbuilders.com/userfiles/file/34368969670.pdfIn PDF document text
    • http://wernitznigg.at/files/11191038410.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/72018043203.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gexobirife.pdfIn PDF document text
    • http://w-mill.jp/images/file/kanufobupenuledajikivi.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/16161021854.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/75451696165.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xenokilizixoxolerexisaj.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/tinojajebowebewesaz.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/438dd4c0a117ccc1d6ea8f5fe2948422/nenufebusakatezufuvedo.pdfIn PDF document text
    • http://wjcopy.com/upload/files/dujipevotup.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/bazilizijixos.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/26040314165.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/kusafimafifejuwel.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/sopefuxozekupopuwul.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/28500973202.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/78663181603.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e01af22ca---27220430512.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/37229225425.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/3700100067.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613cf5af45bd8.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/lazuwodutaburujexejutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=papa%27s+louie+3PDF 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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 17216 bytes
SHA-256: d28e41ae7aaa960ae0b012ae0ac53d668869d7fbd83da05fdfd309c377734556
font_01_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 10248 bytes
SHA-256: 9169fdc8a4c9be948078d870a83a830a5a4507fa55d6e5bd6b78b59540109860
font_02_sfnt_off00013392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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