Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7a32a2e4961886…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 15:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b7acb22805c59b6258c11ff27cd1b999 SHA-1: acb8867116b09c360a0612cee5c427bb73f7dd11 SHA-256: dd7a32a2e4961886f3e20cf63b20966d6450e99495569bf70930314370a909a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, it features a large number of external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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 http://abwhopewell.com/uploads/files/megubuwezerepapera.pdf In PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/vasatatib.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210908_044708_127.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/xuvadafofob.pdfIn PDF document text
    • http://esangsok.com/upfile/files/pexosemosumijipisijen.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tovopiwexidutiriluwisowuz.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/6509102867.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/kisedikibe.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/punuxusonugugan.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210901183637_alo1ag.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/vimalomewadasusezabag.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903075026664753.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/98242451933.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/45880808664.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jokofiga.pdfIn PDF document text
    • https://ghnservizi.com/file/4159571243.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/siwunifakipemusilubivimi.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/tisinaku.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/momobunamolus.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/jowinisikenuvigub.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/xoritapanezaw.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kebutamomidurire.pdfIn PDF document text
    • http://cecev.com/stockages/files/41712648757.pdfIn PDF document text
    • http://www.520amis.com/upload/files/visetumalij.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/85467309503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pdf+watermark+remover+app+for+androidPDF 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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10688 bytes
SHA-256: 45685688cf7a1274e374ad1d6c3dd59e047ad6a1b17c1532a54d4e97babc7979
font_02_sfnt_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 17920 bytes
SHA-256: 106ccc95a011a75963e5dd1b65154fdc0f1bb35566de1c46f443d8217ce5ef69