Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d1d18d391278d7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 23:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f040c9b61821230586cb66e07d20b551 SHA-1: 4e48dcbda764d92bb01546a36ff9ec69a30ca1a7 SHA-256: 95d1d18d391278d7b8ede51c4d3d594b7c890ef48205ca2e55f5461f214bfcea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://medvor.ru/uplcv?utm_term=phone+link+android PDF link annotation
    • http://metalltechnik-kutschi.at/fosarobeme.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/65297920809.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/5965522491.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/panexatefabejamobubar.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/896699794.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/zajupibutapesezivebuvaza.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/13312781146.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/62825264812.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/kufalovatoseb.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/fefuxovefidivutidikugo.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/fusiritenopif.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/99397035213.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/mamikutimifo.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bbcf162c19d08e610291d0c3dfeeef32/kobadunawowalekatetodu.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/37270357368.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/buvunonesalodiduge.pdfIn PDF document text
    • http://askaudit.ru/price/86320176163.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161366c3ff1f32---7964406553.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/vafigevago.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/juxikizef.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/nodujojaneguz.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/tologol.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/jawetepadip.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_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 17620 bytes
SHA-256: ce5cfd7de92180884aa141d04b28485d04fddd255c4cb37d8ab298e875447c27
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 10172 bytes
SHA-256: 6f7fb54069b337a8d66e5f2f2b58ff96bc4753823d454da6452abc2f902f3c95

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