Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a485e15a72810fc…

MALICIOUS

PDF

87.1 KB Created: 2021-10-11 22:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d9aabd25a4bc599a56d186cf35d66d74 SHA-1: 35766cff094694187dd3d48fc231e17e58bd1c14 SHA-256: 9a485e15a72810fc65277d682dca8b62de3f60c808838ce70e857d406d67b9ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+is+the+molecular+formula+for+this+compound PDF link annotation
    • http://hifitness.hu/userfiles/file/xinaze.pdfIn PDF document text
    • http://bptramptour.pl/files/file/46628654681.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fasaxugux.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43221291014.pdfIn PDF document text
    • http://glassick.com/userfiles/file/xolunufipuledolemosisu.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/xufuxiwenisuwegabulur.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/31507384310.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kinidatefaje.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/88477030994.pdfIn PDF document text
    • https://invision.buzyhub.com/files/73878176085.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e413e8864e4911a3509df8294cd17ea1/jater.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/kuwuw.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20211005130402.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/38240577470.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/rejutekulokawitonajejufe.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/kimeze.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/42406922217.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/11422175625.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/48694818513.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/rofireloxipopovo.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/ramifaxod.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/72848141714.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/vonobuzularefasifenuwipa.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/5243695475.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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 10976 bytes
SHA-256: 0f983920fbf910e4288c57706505f346cf247dae11d9aed6cda2234ef4ea95ef
font_01_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 20372 bytes
SHA-256: 7008147becc64beccfe63bc42edc8074b593c8523332712815e4f8fefb9af84d
font_02_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1