Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4334471db9406e4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 21:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77d18958c992c9e4a629d01823d948ba SHA-1: 45d3219606787c139112a26ff38b234687938ab0 SHA-256: c4334471db9406e47d8d669545f5751b6fad8ffcbd3ce21850ed24f5ef589cc8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into clicking deceptive links that could lead to malware downloads or phishing pages. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=download+longman+dictionary+offline+apk
    • http://naplesredeals.com/userfiles/files/13542166030.pdf
    • http://lapawan15.com/shop/fck_file/file/4009830729.pdf
    • http://soc-in.com/data/media/files/gexorubogivixewopij.pdf
    • http://mottaing.eu/userfiles/files/zuzezak.pdf
    • http://jrmhandling.nl/upload/file/36161832838.pdf
    • http://blackhorsesc.pl/userfiles/file/44826845075.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c78cf4d933853cc9a43405f128fad5fb/52479857456.pdf
    • http://poslovniimenik.net/firme_data/files/dopaw.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/57350015696.pdf
    • http://ateliergermain.net/sites/default/files/file/75308394299.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/16436880204.pdf
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/77955446191.pdf
    • http://burchiellati.com/file_fck/file/gijonozefagolodufizu.pdf
    • http://93564497.com/userfiles/46671160791.pdf
    • http://bidwoodmachine.com/d/files/21378950056.pdf
    • http://jindi2010.com/uploadfile/files/wusevorifaxibimadazuxu.pdf
    • http://nadiadsa.org/userfiles/file/73957193215.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d70ab3b28689eb07dcc02076d8eb6f3f/roxagijevibefiw.pdf
    • http://mastrodibaglio.it/userfiles/files/18164224060.pdf
    • https://brtim.com/uploads/wysiwyg/files/44006133157.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zafaputozemago.pdf
    • http://palami.by/images/file/48779901290.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mebojafiborovuvevivoras.pdf
    • http://www.slappedtogether.com/editoruploadfiles/file/zimuko.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jupipawujadejoxod.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/70342347551.pdf
    • 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_off0000e82a.bin
1518a85a6cc0b464f495459e3400a32b415569aef3c3e6e57a9f422bbbd7af04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 11088 bytes
font_01_sfnt_off000101d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 16792 bytes
font_02_sfnt_off000119e7.bin
eea606594cec3a44b44581da76dac621adfac669c08a143cae2e3a4c85291c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 17684 bytes

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