Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed31e1b23864396…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 22:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dfc70cf78f73ceb5e1ed43429677369c SHA-1: c6b99468752aaf98bdaabc9d61da5deee4ce18b7 SHA-256: 5ed31e1b238643964881d9cb3d39d50f18761f86ef2fcb5f3ee4ea6ace558e14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=justice+league+war+full+movie+free PDF link annotation
    • http://turinhotelcompany.com/userfiles/files/zijutesirowojelopofajavag.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/69162044875.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/fivifafadonidulesa.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/basuvo.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/50427817198.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/21895007906.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/jatimajigerovega.pdfIn PDF document text
    • http://domuran.pl/files/file/55727973486.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0e2664c7---bekelulemekutubenolagupo.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/lezafunowaziwu.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/xavajolixid.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/90988972987.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/mepebugatuxofej.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/68684123519.pdfIn PDF document text
    • https://10fci.org/userfiles/file/fojix.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/senujibov.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/puzukaz.pdfIn PDF document text
    • https://membermimpi.com/contents/files/33420160802.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/57581369197.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/delowad.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/73ff49bacc346e8d2d24009d557d0f93/daveperi.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/wexadixarutokudaxifi.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/javagopamewomekalabele.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/sivulupelulivab.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/46478681536.pdfIn PDF document text
    • http://gekon.net/userfiles/file/besidekifegelu.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_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 18288 bytes
SHA-256: 11953839b38c3b9eb4c526d09df29372eb976a0cafe84f00a6c2e2bcadc08853
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 10820 bytes
SHA-256: 85b594535bb82124510d21f647f9c879cc862b37715c1bc8b9032e7d16c5fb87