Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d61630f4f6c5a01…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 18:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfbcf9708bd1376cbd8f90f4c1599bf0 SHA-1: 826c66e6310284e32b7b8ec155e1673c1cf05ce9 SHA-256: 2d61630f4f6c5a01ba12d660e9117ad3d96afed4d0d5ab867bae1699e389a847
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links pointing to disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://be-now.pl/userfiles/file/weduxalaminakenoxibuz.pdf In PDF document text
    • https://fabriziochessa.it/userfiles/file/vovataxojovofefalavu.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/bebijubexosefonowexetorav.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/48787463037.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/17969704960.pdfIn PDF document text
    • https://sambelteri.com/contents/files/lakokusijefelexosaxa.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/65237981824.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/33671114638.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613475a31ad28---mikasivelalolibaliripex.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9fb3d591c---34830428976.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/tulupinafeposipade.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/4685002872.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/gusumobojejubadera.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/96742105594.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/tuziveso.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/jafapoxe.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/nojunomosamosix.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/surur.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/kodojis.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/97502777244.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/995732805.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913142517914686.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/puvaromobibivopa.pdfIn PDF document text
    • http://lagrupacio.cat/file/golexawijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solving+simultaneous+equations+with+fractions+by+substitutionPDF link annotation
    • 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_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 17712 bytes
SHA-256: 40e0740cfa294f941570dc85d01e22a95cd0c8b9614cc262b78e821bc8685d9a
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 11508 bytes
SHA-256: d2d293b604483bf615140bcd99a067d921687e9459a2d17ec55fc636f4194e33
font_02_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1