Malicious PDF — malware analysis report

Static analysis result for SHA-256 8910d6f5757ea3e3…

MALICIOUS

PDF

89.9 KB Created: 2021-09-23 09:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da59a6767a9f668ea500fda00b1ebbf3 SHA-1: 4ab3cd255b883e59690f6547e523eccd81802b6c SHA-256: 8910d6f5757ea3e3aa2fb8d5b727cde13dc7e64b3b5350be762ed2a315c5899d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=ethos+pathos+ethos PDF link annotation
    • http://fatimaartwork.com/userfiles/file/pixawuporam.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/lomuzuwugolidu.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109071504283821.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/robipivi.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/45045373677.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/wepezof.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b1go1ilq53c2j2eph3vlti42j1/liwas.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/lafudozogula.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/wiludenuzuviburad.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gasetawasoxadux.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/56583264050.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/95544258382.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/66680733044.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/miworiresolidazaletebugaw.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a318a69e46---xixepalakakemifututagudi.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092121041050.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75901304898.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/62262073959.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/3677330116.pdfIn PDF document text
    • https://laps.pl/userfiles/file/mirolafuxivirile.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/43661853930.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zukegidolafogiliv.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/ruvojarudatubu.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/dujinotigevadetalujava.pdfIn PDF document text
    • http://autovoda.ru/upload/files/41782340235.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210906204714827.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/wijolozem.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/folozokesewepoxuka.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_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 18672 bytes
SHA-256: 3170c31a0d26e7de870bc9ca867d40a522a39812827123461934c583548525e7
font_01_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 9992 bytes
SHA-256: be3de2957bdc821b30ddc329c63327380306ac08d3189bfb7752fada29bdca8a