Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac2790963fc671d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 13:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41819422c5c96928d41cb691e988a716 SHA-1: f7e0f50afceb891504b4680986cf03af3bf69862 SHA-256: aac2790963fc671d87c29d2da7242bd78bdcc50a37755b0fa9c2c9e5d713324c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code or redirect the user.

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 https://suruburi.net/mm/file/30090004502.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/842901856.pdf
    • http://dobrejaja.com/Upload/file/49122169026.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/29dfl1pr40ju82gq05vm4g7hqv/kuzikona.pdf
    • http://sunwisechem.com/Uploadfiles/files/polifuzemafizupewosubati.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/1863202809.pdf
    • http://3qlohas.com/CKEdit/upload/files/puridesuxelofedakud.pdf
    • http://aapltd.net/userfiles/file/masodofurig.pdf
    • http://machinesupplier.cn/data/product/file/202191_61315_357.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/62869404318.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36b720871---gisagaparisisarin.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/73924220940.pdf
    • https://mldom.xyz/web/img/podborky/files/98221998831.pdf
    • http://cofetariafraguta.ro/UserFiles/file/kubokabo.pdf
    • https://towa-aaa.jp/userfiles/file/ronefabazev.pdf
    • http://sinching.com/uploadpic/files/202109091908212196.pdf
    • http://viorina-deko.com/images/file/32892083737.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/65556254692.pdf
    • http://limobebe.com/userfiles/files/wubuzowewiridirolugus.pdf
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/33806152667.pdf
    • https://buzascsaba.hu/userFiles/file/dubijajov.pdf
    • http://gymostrov.eu/gymostrov/userfiles/file/75476397646.pdf
    • http://naso10.com/userData/board/file/nisezigagiturovujanited.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/64044249990.pdf
    • http://3sdent.com/upload/files/lepowaxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=obb+file+for+wcc2
    • 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_off0000b64c.bin
441e89201b24a5dfeac02e1d6fcd503738bd85f8d2a1f6051440db672388e5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB64C 15688 bytes
font_01_sfnt_off0000de73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 16792 bytes
font_02_sfnt_off0000f68a.bin
7e963671619414959fb1c651102a72c1171321a086f6be8baded85ccbdb880d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 10168 bytes

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