Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f11f176d6fe0ed…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 03:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 720ab3c0692cbb8e89e2b885ec853ea3 SHA-1: 35ae63c7e75fecbb0475ce966e43fa1e46e0e7f2 SHA-256: 62f11f176d6fe0ed19fc7faea79b4cd7e822542d9d0a630de63b2fa72ccf86f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to distinct domains, suggesting a link farm or SEO abuse tactic. One URL, http://unitez.net/images/newtech/files/bererutametogugetefobimud.pdf, is identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or distributing further malware.

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 http://unitez.net/images/newtech/files/bererutametogugetefobimud.pdf In PDF document text
    • https://newsru.md/upload/userfiles/files/69561041501.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/24528707080.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/legixoputumeguvaw.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/pegaxuvasodole.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/tiloj.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/56649670961.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210903205425.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/gilawoduxuwumofetam.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/koluvobanijas.pdfIn PDF document text
    • http://lachina.cn/upload/file/86176105172.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/gopofawifaginesi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/voliwoguzobanor.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/15822693047.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/86115683218.pdfIn PDF document text
    • http://shahgrp.com/uploads/73003811226.pdfIn PDF document text
    • https://maria-galland.ru/files/file/dudunebobu.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tuzuzobexurunuxaxeru.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/fijiwofovetu.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/35121008567.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/94029971389.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/23100304652.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210907231007.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89384194415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=crossy+road+play+online+unblockedPDF 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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 17096 bytes
SHA-256: cca6a929dedcfeb11fe08373712d8e6aaf5785ac33239a026de116d576581470
font_02_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 10888 bytes
SHA-256: 315e28368ece5dfa5c9c9d801d264528e42e2f6f75590049611942254dfc0f0d

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