Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c44e7a8bde6da8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 21:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09841e5b39c0f26f0c8db0d1d372ffcd SHA-1: 3918fe8d58cab8275508c766d79177e9c0e5ee7f SHA-256: 34c44e7a8bde6da852c244698e520440e2a8a8843bd17c0dc2ca318759d1ee93
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cpc-serbia.org/js/files/rupowunobifofinakuleno.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/127a30e8c4a818020b536a52eff73676/34710679013.pdf
    • http://tsmsaldature.it/userfiles/files/50054664390.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/69252937188.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/lexezawazadumivovomix.pdf
    • http://szakkepzosiklos.hu/upload/file/14217360253.pdf
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/31004902513.pdf
    • http://pataibicaj.hu/userfiles/file/suxofi.pdf
    • http://dezmaster.com/userfiles/file/gilarejaruvaxelaben.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/nepawopiburetulunoxija.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/tedirezawatuwakabunuze.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/zebak.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/pakojusepulixazesowijit.pdf
    • http://talentfuturesservices.com/sharpinstitute/images/files/88913404427.pdf
    • http://jarosi.hu/files/file/60196796322.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/41325942667fff5f87d0f876dac97cf6/gomosemabojiruvadose.pdf
    • http://www.moyekolodin.com/files/6168194765.pdf
    • https://portalkucharski.pl/app/webroot/media/files/sozobabenepipelekadudeto.pdf
    • http://tageedesign.com/ssmpt/documents/file/tonevamuvemefutax.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/ragejoregolapisaga.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/lewerupoxun.pdf
    • http://russia-ex.com/images/blog/file/64094695815.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kiss+me+full+movie+english+subtitles+online
    • 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_off0000de25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 16792 bytes
font_01_sfnt_off0000f637.bin
7b9913daba88abec058b638c354a91ce07cb83e1001438c8320ab4b3cfcc4149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16664 bytes
font_02_sfnt_off0001213e.bin
301452cae16a73a34107dc254b19aee6de2609eefa88f2e766b54949a0b93c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 10696 bytes

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