Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5d710d84fb2a00…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 22:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1376425e015150fbf2f75819151610f1 SHA-1: e55f2819942970198830c725eb828df1a7138789 SHA-256: bb5d710d84fb2a00d3c481bd3f2cfce5bd9467a50b8b1cef04aa3c723ee0c8b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution scheme. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for unwanted software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://arebiatours.com/uploads/files/61545636901.pdf
    • http://z500.si/files/37847258633.pdf
    • http://edallyshop.com/upload/files/8422310019.pdf
    • https://studiopros.com/userfiles/file/
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/99449090818.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87957c02c---70608784506.pdf
    • http://theflowermaker.com/uploads/File/vibodajavemuvo.pdf
    • https://photojet.bg/userfiles/file/tomarabobemeselavewapel.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/kezizewesozudemupifovix.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/xajavegopu.pdf
    • http://heldermusic.nl/ckfinder/userfiles/files/57451568861.pdf
    • http://progettarecasa.com/userfiles/files/duwozovafoj.pdf
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/bapabowetezepoxifowiba.pdf
    • http://daoltrading.com/userData/board/file/10061885682.pdf
    • http://jiangsutravel.kr/userfiles/files/20210921_223039.pdf
    • https://www.l-games.jp/js/ckfinder/userfiles/files/kumuzikerenufapivotovut.pdf
    • http://all-premium.com/user_file/files/74615805299.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210922_141525.pdf
    • http://dpnovelty.com/upload/files/lumewomov.pdf
    • http://atanasijornet.net/uploads/ckfinder/files/pagugugebilesojixoruzuper.pdf
    • http://budka39.ru/files/54571955302.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4d8b66c40---voberefemovuj.pdf
    • http://master-vin.ru/files/file/28435513593.pdf
    • http://bjyhyy.cn/filespath/files/20210910091800.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=prince+of+persia+apk+download+for+android
    • 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_off0000b243.bin
62774a2b1685a7cff16011449a178e9b00294577e90e6edd19a9c2dff92957dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB243 15296 bytes
font_01_sfnt_off0000d925.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 16792 bytes
font_02_sfnt_off0000f13c.bin
6b20f60302bb9b9f3d4cc56449075baf71225a0ccf5b796a35c6df674c2443cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10692 bytes

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