Malicious PDF — malware analysis report

Static analysis result for SHA-256 95920f8927ab8d20…

MALICIOUS

PDF

70.2 KB Created: 2021-09-30 10:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8b16f66817804d41849a3273ddc53c5 SHA-1: 55eb984b09c11ac38e4bd3a13c0a946b1b55fb72 SHA-256: 95920f8927ab8d20f2542d988fec41494761aa65d748d0aad83f431534fcadf9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm, indicating a phishing or malicious download attempt. ClamAV detection and ML classification strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of embedded scripts and the link farm heuristic point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5nid41a0sli9uaghseraukpcra/84012331687.pdf
    • https://adesso-moosburg.de/images/file/80524315808.pdf
    • http://liyangah.com/Upload/file/visetagot.pdf
    • http://fajni565.fun4two.pl/uploads/assets/file/xisusexuka.pdf
    • https://refoca.cenacat.org/yiicms/ckfinder/userfiles/files/1127275643.pdf
    • https://hbfilm.ca/resimler/files/74354389116.pdf
    • http://pantipplaza.com/userfiles/file/jibef.pdf
    • https://cokhivietuc.com/img-vietuc/files/xebimikog.pdf
    • https://drivetripper.com/userfiles2020/files/leliwikis.pdf
    • http://theclelandgroup.com/img/upload/file/kixezi.pdf
    • http://vattucongtrinh.com/userfiles/file/tevopebunogirezolug.pdf
    • http://crmrealty360degree.in/userfiles/file/75755335608.pdf
    • http://eyupsifalibitkiler.com/resimler/files/nivizefegegutali.pdf
    • https://lean-ds.com/upload/editor/file/foxapomedupud.pdf
    • http://rakkhunnursinghome.com/user_img/files/patuvajiferelikeditepis.pdf
    • http://mamolenasnc.it/userfiles/files/wuwovusu.pdf
    • http://inica.org/files/file///susuriwipiredajav.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4a6288478---xenujubakekakakinugosew.pdf
    • http://hyundai-baoloc.com/luutru/files/varuteporoza.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/61336904318.pdf
    • https://arab-hams.com/Ups/files/jowejilivuru.pdf
    • http://weiddy.com/uploads/files/202109301507162903.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///24455556683.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83313540941.pdf
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/ratuzinanikugetepanidu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wrestling+revolution+mod+apk+wwe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b10e.bin
c524e013b0035e70a23ce23daf2c058b1ddb926bc694ee0b095e1e31c93cd8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 15888 bytes
font_01_sfnt_off0000d9c1.bin
492b71aa782aa95fee1f96f9ef111112164e567e6f3e26b9869d2b39090f7051		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 11072 bytes
font_02_sfnt_off0000f367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16792 bytes

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