Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0fb9de51c7a711…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 23:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2339ffe77a4349dab0d78e113f471151 SHA-1: 760cdfdeb9cac0f85b13f96eaf5acbdd28636733 SHA-256: ec0fb9de51c7a711cf278bae7f8e3624dd048734465da05c710c804dd86277e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to lure users to external sites for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=ppsspp+games+roms+download+for+android PDF link annotation
    • http://www.workbythai.com/admin/assets/images/roliparapomazujodegaxo.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210919003409.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/pafataruwazapupoxamupolo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/bokexigelafi.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/xamafinorujetorupevoxoxuw.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/loponine.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/sidebavixajefejadan.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/tajunet.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/tikakubelusupok.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/farirarafimuga.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210914_012506.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/86228640168.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/56512252976.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/72567251694.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/4288312034.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/mudiluzujozunugibasoponep.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/subivifadidapuv.pdfIn PDF document text
    • https://fond.ru/userfiles/file/fijurozator.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/60237993296.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/66905457369.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/dipunorurobuze.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109100034167806.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/22323110729.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_off0000aed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 16704 bytes
SHA-256: fb0c6bdb78e93dc6962a16c0302a9d3e95316235ded153b100bc9fb7a048ec02
font_01_sfnt_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10828 bytes
SHA-256: c1cae303d6ce9d79bd4bf2d1395a0570417f2d4a3c4be8f5131a2a62a03c5dce