Malicious PDF — malware analysis report

Static analysis result for SHA-256 809421dcac3db683…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 08:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98bdc7bd9f09caf151147acdae7d559f SHA-1: d9c3cbe2322c7ec908410faf84e0221d25fa2f7c SHA-256: 809421dcac3db6835100c1dc459962a45990c9f3eb806acadb01407e4881f7e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161395a0e276b8---25079782585.pdf
    • https://marblo.com/app/webroot/img/files/93978972525.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/toveninazarege.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/tutogog.pdf
    • http://tuvanluatdanang.com/upload/ck/files/49612165671.pdf
    • http://architettotamborra.eu/userfiles/files/zawoverunaxu.pdf
    • http://atek-ent.com/upload/file/wepewikuloxiba.pdf
    • http://barahi.com/assets/userfiles/files/84628131695.pdf
    • https://partnyor.az/userfiles/file/jexigovorajajorosovoloziw.pdf
    • http://dubilex.com/userfiles/files/83016752787.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/tirosus.pdf
    • http://8njl.com/userfiles/files/70106189140.pdf
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/17130605799.pdf
    • http://elistaprezentow.pl/userfiles/file/berenumifilabizuwofanura.pdf
    • http://raylutickenterprises.com/userfiles/files/rolufofojovig.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/xabavoli.pdf
    • http://ingore.cn/upload/files/28447508789.pdf
    • https://a-metal.e-giant.net/archive/file/files/fajaniritatejefa.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170241b346---88283660955.pdf
    • https://adproissy.emailingmanager.com/uploads/editor/file/rirulesipix.pdf
    • http://futboltotal.net/images/files/xibejon.pdf
    • https://childprotectionindia.com/lexcyberia/userfiles/files/mogexoxoxuxudibijasasuril.pdf
    • https://eko-briketes.lv/userfiles/files/fuzawowokemazuginagateg.pdf
    • http://homeopathyhongkong.cn/files/fogonelikunanijuwemis.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tuguwaduvusopitoxu.pdf
    • https://acrgruppe.de/userfiles/file/molixonibelobolamulopefun.pdf
    • http://sarljarry.fr/userfiles/file/valukufavisuvewo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=avakin+apk+mod
    • 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_off0000cbd0.bin
e649c8803a2ebd1be18d9f743e32526845bc188c61808f51c5d8bc989ae43192		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10148 bytes
font_01_sfnt_off0000e26f.bin
9b52d9710224a958746a78df61811b3ce45195ccb321a1fd6a74dd17f3fc6bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 20960 bytes
font_02_sfnt_off0001188a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 16792 bytes

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