Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d63d073c62e188…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efba03e5885a88450850a13d54b743fc SHA-1: 571347dc0f1ef8bcffa3c323893f540083725931 SHA-256: e2d63d073c62e1882624b7ce21d2ea2f7ff4d8a4aa2da849923674d8ea24c327
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are configured to host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.bevillelecomte.ovh/ckfinder/userfiles/files/21430648146.pdf In PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kosovujawafaxarubido.pdfIn PDF document text
    • http://planetamama.ru/files/file/jajaxutite.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/xumutuforefogulezam.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/91787367322.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/27103219941.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/38026517127.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/84786163822.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/rapudinujij.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/18250034959.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/29747209657.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mosokedizamutuwa.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/futagipugalugite.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/woxopo.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zotupetusajusutis.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xuxixajejeredugasapuji.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b313030970---pozin.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/zabokupamasedazavelo.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/bakoliwesogamevemorox.pdfIn PDF document text
    • https://bczenekar.hu/files/file/pezosu.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202192175742.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/69663605615.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/gokovilorawiwukufulul.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/ruwukumefalo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d29c9313---suxofe.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/vatebopuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=piano+beat+maker+apk+downloadPDF link annotation
    • 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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 10704 bytes
SHA-256: 34ffa1bfa7de871c6a87ee7c0a3b0bd7a56b55887c06cb68a2d7fa163b3d1075
font_01_sfnt_off0000e825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 17932 bytes
SHA-256: d1817d7cb9ea89532fb58a4d5212474a70158dd6e13366775cf61c8f982923d2
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1