Malicious PDF — malware analysis report

Static analysis result for SHA-256 572e7b65a6aa6038…

MALICIOUS

PDF

87.0 KB Created: 2021-09-17 01:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abef33d918e178a9780f3e943d19f0f0 SHA-1: 67a77c644a219776ec047fa5f906e9d1aaf722a5 SHA-256: 572e7b65a6aa6038f45a0fd5caf61c856d22c6e7f0a0c950cb129af4db58fae9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded links, many pointing to disposable domains, which is characteristic of a link farm designed to redirect users to malicious content. The primary goal appears to be directing users to download further malicious PDF files from these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://noxsun.com/jingkelun/userfiles/files/20210908015452.pdf In PDF document text
    • http://swotaweb.com/img/upload/file/sotobinasamigo.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/jowaxajopo.pdfIn PDF document text
    • http://contextuae.com/resimler/files/9966710491.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/12142945776.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kuvazobusowajowedexujidu.pdfIn PDF document text
    • http://esteel.my/userfiles/file/walon.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917052006788664.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zonapalajebenepezubodid.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/86538608491.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/43450577141.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wezenok.pdfIn PDF document text
    • https://posh.hr/files/vuduge.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/3567326302.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/19031758374.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/wodowujigusite.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/70916873325.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613867dc71f89---jumojekegifunakejet.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/854003765.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161343f21ca7b5---kijopomasakorikorawufun.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/14076492187.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/jawulufidal.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/41851163798.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/mozesazilono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=video+projector+simulator+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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 18368 bytes
SHA-256: 5740d6a7388fad0b97fd46b8ac21821ae0ec087b9ea927765af795ac4b9c0a85
font_01_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 11052 bytes
SHA-256: c438edc0690f2d7166e9668268b264c2d1af13a1f12b847ff1d533c041d7aaa4