Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb4df577b3ecab9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 00:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26fd6ea9ee96fa8ca7e0f14c8ead8f75 SHA-1: d768bb403da29ff6e7e7cd886e4e1b1e766459c8 SHA-256: 7eb4df577b3ecab9f9b671cd4d6eaa1c661f095832fab4bb596d006fb6a5964b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm and containing embedded JavaScript. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external URLs, many pointing to disposable domains, suggests an attempt to redirect users to malicious sites. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, further supporting a phishing or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://chambres-lannion.fr/userfiles/file/revapugasevemi.pdf In PDF document text
    • https://greenline.bg/userfiles/file/solusapozosonozeleba.pdfIn PDF document text
    • https://buyafranchise.org/files/files/jobudobitukitu.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lasowunokezasamabunode.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/64601080830.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/lozumimez.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/72320022293.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/71346193365.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/kizej.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/geratibigawona.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/39814787190.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/16083227583.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/72414502152.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/72333448454.pdfIn PDF document text
    • http://fxmeat.com/upload/file/e7d22a07217ee781d61be5adf039d06a.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/tabute.pdfIn PDF document text
    • https://apra.pl/files/file/68358632057.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/87174465991.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138082bbbf1f---73953194862.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210907193247.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/falekotovezafotutupono.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/2079203667.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210907090402.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210904235042.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16308750021231085986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=qr+reader+macbookPDF 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_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 18568 bytes
SHA-256: 52c6574318154d333de225e9b85fac0c2d6b8b51429e63571ad80a245cbca712
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 10316 bytes
SHA-256: 623ec1d846124058a5d120e1dd5dc4592b2898e93a42f891f464531d2181ec27