Malicious PDF — malware analysis report

Static analysis result for SHA-256 523d0b0440ba1bab…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 16:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 951c160d412c3c201980d6fe0283e01a SHA-1: d390587d2b6bfcb3573028ab311888f66b6afba5 SHA-256: 523d0b0440ba1babd58bbde426418163934916b15d739d980c40d09df7bfc224
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to unknown domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fanghsin.com/uploads/files/202109030053027567.pdf
    • https://mkontroll.hu/File/rawemilinafi.pdf
    • http://rosabaum.de/web/editor/files/gawusabijema.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/55523583200.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210914112549.pdf
    • http://ruishikaishi.com/upload/content/files/2021/09/20210908054334.pdf
    • http://recko.ru/ckfinder/userfiles/files/wesomesabafaruk.pdf
    • http://harasim.cz/uploaded/files/burugufikavufovesos.pdf
    • http://studioriboldi.eu/userfiles/files/jobibolijitok.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/2172165702.pdf
    • https://raovat72.vn/uploads/news_file/mupovafapadujiwa.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/demasujasozivepil.pdf
    • http://gddfboiler.com/uploads/files/64844272366.pdf
    • http://www.klccpa.com/userfiles/file/
    • http://isystem.hu/userfiles/file/pujuv.pdf
    • http://finproekt-msk.ru/userfiles/file/96593896866.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/zujetuselakikoxepuxope.pdf
    • http://travellerisland.com/files/53532676061.pdf
    • http://idealthailand.com/file_media/file_image/file/puluka.pdf
    • http://thegioioto.store/upload/files/73135109766.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6dbbe7e6f---75515499466.pdf
    • http://shannonlakeestates.org/fck_images/file/gigolijalijananuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=300+miles+to+pigsland+unblocked
    • 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_off0000c4ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EF 16792 bytes
font_01_sfnt_off0000dd01.bin
6b68a370915551a1415da83827fcd870039a62ce9f5d0c9af3ac8bbd3422feec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 18824 bytes
font_02_sfnt_off00010ea3.bin
9e3d43f6139872bc8c52c6b4bb50e464743ed20abbcb26c5951b09854fdee4f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 11288 bytes

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