Malicious PDF — malware analysis report

Static analysis result for SHA-256 973da8610bdf55e7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 23:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9217c042caa3f22786c6f91189a0d655 SHA-1: 6ab4ddddd3f98a2209e093e1585cfd536b9607f2 SHA-256: 973da8610bdf55e71e88fb8a5b5be7d66f93e99b5c2c2b58b67bfabf3e460781
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains or IP addresses, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://cructi.ru/uplcv?utm_term=cool+math+games+hardest+game+ever PDF link annotation
    • https://istanajp.com/contents/files/jenug.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/wezimifuv.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/leremuvafesujujawowimi.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/38217220043.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/latufofegabomubabena.pdfPDF link annotation
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/65586257000.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/jumivamozugesirabizufo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/91014939404.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/nifobawunexamonitoko.pdfIn PDF document text
    • http://gameadvisers.com/js/new/fckeditor/userfiles/file/dojivomi.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/98673604100.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/7990167491.pdfIn PDF document text
    • http://carbontuning.ru/file/pawawojuxewevetejir.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/97129305930.pdfIn PDF document text
    • https://cristalensi.com/public/File/dagebefiri.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/bolesefokugumizefetosug.pdfIn PDF document text
    • http://contelex.it/userfiles/files/48617721319.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/41814496139.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/suruzi.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/rakotixugesijawaf.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/jitaxasixorakomujuvoto.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613634110fb86---90536730615.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/10830915183.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/5932132681.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_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 10596 bytes
SHA-256: 1dfb3ec902594ad750d5566782930c7e396c8adaa7d71e77c6888983c7c9dcf5
font_01_sfnt_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 17204 bytes
SHA-256: 30be2d8414fd70932807ecc004916a60f4f80a1d6a25454f6e8b71293ffaf1a6