Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc626a3e0e2177c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 03:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4d107d0d017a3e4007a2fe8dcd00954 SHA-1: bd746857b1b6a144e3bfee1fcac92df88fc43544 SHA-256: 8cc626a3e0e2177caa99a26dc8788a865aa0d13a3dc324db5fdf733f39d0edf2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) and the overall nature of the links point towards a spearphishing attachment (T1566.001) used to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=rick+and+morty+season+4+episode+1+free PDF link annotation
    • http://conblocmanado.com/pics/file/nilakilakosopezoba.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/77587004814.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/tapematuxabewowugaxirij.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kakedexu.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/xakakoxoneramewozefose.pdfIn PDF document text
    • http://eichler-kammerer.de/kalufasijosajojufapago.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizigavomidasuduzosamuzu.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/riwavazojix.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/xalatev.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/ribavafabinivoropuba.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69403588232.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/nakowugazuzis.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/60522968499.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/73963702025.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/96975862663.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/78759642662.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141605264981.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/22820235164.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dojeno.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/xopoxavene.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac74ac736---25447535668.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/vebororegejuwixuporule.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139302d62418---28359090190.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/pakajegu.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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 17272 bytes
SHA-256: 7bd56cf4edfbc266c2756df344f4ed702cee57e86090c6382a501b0dd43168f7
font_02_sfnt_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 11116 bytes
SHA-256: 996510450761a1881cb5757214be47e66dfe154c0586e81b55f39a23b792180a