Malicious PDF — malware analysis report

Static analysis result for SHA-256 27da09c21a91fb93…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 17:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd993a67abb964baabde5d33744aa06d SHA-1: 4a52afc87ab506a0bdcff21795ced7c3c822dde9 SHA-256: 27da09c21a91fb93c1b5d6fa056eb3c4291b1e0a8ebeb75e6f860c7ea2a7bb17
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution vector. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=como+instalar+whatsapp+plus+para+android PDF link annotation
    • https://dalnoboy.com/data/filestorage/upload/files/56090253801.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/9116531940.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/tesalunamarifurupetowu.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/nadimuverisoduterove.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vasurozonudaxilosetibo.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///xuzabakaw.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/nutisupalerib.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26b943e9---42707417426.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/13335721384.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/72638117796.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/renepeloxovapamud.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/niliwarulutevuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f70751df3---zefenarewuriposun.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/7236465591.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/lilajopotaparowilaxanede.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907160322885675.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/83037298516.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/78735213114.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/wifizejiguxepuz.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/8729464645.pdfIn PDF document text
    • https://majubesar.org/contents/files/907430840.pdfIn PDF document text
    • https://tempegaring.com/contents/files/11989235505.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/xekomex.pdfIn PDF document text
    • 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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10740 bytes
SHA-256: b9813a4ac921679d9783029b2946264dd542c349e39507de7dca2f6da305cda9
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 19892 bytes
SHA-256: 1b279dfdf7e6d6411ec14717d214dca037dfcf279756289fe31d61f3c83b900d
font_02_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1