Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b90ace44fc52873…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 13:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f40a627c21a9b995d2b26b463ab124f5 SHA-1: 7d304114c87cf52609dd15b4e5df04f6998108dc SHA-256: 4b90ace44fc528733b311b766abac4022dfaeae3d2dedda5d6caa4a78285edbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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://goldmustang.com/files/files/pupivitazusoveleg.pdf In PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/60565799359.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/donulibup.pdfIn PDF document text
    • https://magerp.org/upload/files/wukofogerefadosar.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/85924141834.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/rivivobilowopesozab.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/52701593456.pdfIn PDF document text
    • http://gazetavk.ru/img/file/gojutavovabutexavuwom.pdfIn PDF document text
    • http://gad-elhak.com/userfiles/file/34706980593.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb74cb271a63598abe28bc8c4196595/goraronutegapakofak.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jamituwigegumofamulofil.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/51630524180.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/26382266157.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/bebikix.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/65339117806.pdfIn PDF document text
    • https://fishuntpesca.it/file/66311190929.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/vasugutemela.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/93311755853.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631576735.pdfIn PDF document text
    • http://melabo.com/upload/files/48022672435.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/42881258747.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cd76e8044ed40a5684bb374249d6c40/fowat.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/74012297652.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/gedejuz.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/43264819303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+backup+sms+from+android+to+iphonePDF 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_off0000bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 11248 bytes
SHA-256: de7259c289bdaff837a7a295aed8e5f0d3bc780ec88cb758af4ec28e1b771c77
font_02_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 17104 bytes
SHA-256: 3e507ae10d25ccf2da3758107c396f998c9f7c42455de557e72fd4c0bd7892c3