Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b5f956873e0b36…

MALICIOUS

PDF

69.3 KB Created: 2021-10-08 08:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7884da34732de8116a3b784ad3a48372 SHA-1: 5c8dd006520164a3f7b04cc0bd4cd771c7b39e15 SHA-256: b0b5f956873e0b36858058d0bfb75f897fbc753627e731147d1d789670bbd4f7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to external domains, suggesting an attempt to redirect the user to malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=what+does+iss+mean+on+id PDF link annotation
    • https://mkontroll.hu/File/58588225429.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/dakirulokapexenu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q4l6d5ovjq51kg39rg7dd5nqj0/56521039717.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/bapufabofuxuzozemi.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907123527435620.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/tazekawome.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/solovufunutututibit.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/vetojozunitav.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/tadogixeziguzonofe.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/favonubelu.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/puzunanomemuxiwulu.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/538837296.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/davat.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/57136982377.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kafagivulajifogarifuxonow.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/73903647203.pdfIn PDF document text
    • http://artospace.com/pics/file/58274998625.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615fc23fa6e61---99207749711.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/bojasetenijolefosefa.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/62668783731.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zefewujebupulit.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xozudozegugokul.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://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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 14908 bytes
SHA-256: 0699f0f3da5e52eb2061293d66ed909e88c4e217559bd74c08c50dd216bd04fe
font_02_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 10360 bytes
SHA-256: 3ae8e92eee06b3223b6adab59f6c3f54e7e01fc527bb2a1672d0f616ec74bdb3

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