Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b42317f79b17d2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 17:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07cbdd8f0f8de400c0e610e680a45443 SHA-1: 47c24bf3a6fe6b2082f7ef4bbf87e6c53b3228a5 SHA-256: 78b42317f79b17d26e46098cbac4c4369cbcde81142df6add2c04e90fbc25659
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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 http://jobsandhi.com/uploaded_files/userfiles/files/wovimubimegotidomulug.pdf In PDF document text
    • http://k1a.ru/images/files/file/forar.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/ximededutoja.pdfIn PDF document text
    • http://kag.fr/userfiles/file/vavagewowirefuti.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/58669064629.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/bidetitos.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aad21c345---rabakokegolevovuxinureril.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3547337ca8d3c2879a063c5d92208ee5/gujaretalejifupajepajebav.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/95179281478.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/77766701893.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/lumogeme.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/5161546199.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/93852300336.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/pomikajerevomiluronu.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/36549550795.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210901205254.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xotonerib.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/guvarodusufomilusux.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/dugesejixiv.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/9197579749.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/duwilexawajomo.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/luzutem.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/34704203930.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/ronulunanu.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/kojulutof.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/kevurumopuzozagejekudafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chevrolet+sonic+2014+lt+manualPDF 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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 18728 bytes
SHA-256: 78036f4130fc06c9059b857e6c1864b6594564d73ca817086c51052c30ea6bed
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 11064 bytes
SHA-256: c0a9154588950159c4073ac02777c63b444b50003631bfcb5bb2f0d7cb9a6bb3