Malicious PDF — malware analysis report

Static analysis result for SHA-256 780a42e93ca9cad8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 08:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3110d4dff5efd02aa02576925ce50b8 SHA-1: c00bddab9c2405d182e89db7874f21a35f2180f9 SHA-256: 780a42e93ca9cad86a87310414dd41b2c76e029eb3145f5a27d6ada2bbce9e2a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=die+besten+gratis+spiele+apps+f%C3%BCr+android
    • https://institut-arabe.org/ckfinder/userfiles/files/85226594892.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/juvanogemimanep.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/6868122806.pdf
    • http://flomojapan.com/upload/files/75543011732.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614127bf4f334---97053392076.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210916134800.pdf
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/39534413068.pdf
    • http://gayaarchi.com/userfiles/file/20210909233019.pdf
    • https://processwork.archerhuang.com/ConImg/files/29216915140.pdf
    • https://maytinhdalat.vn/images/uploads/files/doratubalosufibipojuv.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a8efc29acae748cdae5fdc2338a54353/82808277560.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/borosotir.pdf
    • http://efuturesthai.com/uploads/files/buzubudimujixutipawij.pdf
    • http://indecomavo.pl/userimg/inc/juniwuvuju.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/nurofujozekopanabo.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/fejafigapekoxodefop.pdf
    • http://z500.si/files/nupibufawana.pdf
    • http://kfoodntea.com/dataroom/file/kivivemul.pdf
    • https://bloomeng.com/uploads/besewob.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d0ebd643---59714411975.pdf
    • https://mediaget.ru/userfiles/files/tosunogepaz.pdf
    • https://rmp-familienanzeigen.de/cms/files/75065538694.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/beribavutubatobidaxozisop.pdf
    • 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_off0000c967.bin
be2fcfc8cf0fcd7d8f1a8bf3b057956fab684095623dac4f47e6b5051652ccac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 19360 bytes
font_01_sfnt_off0000fac7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 16792 bytes
font_02_sfnt_off000112de.bin
3a56d9ebe945116fe39aaaa1d03a0a83dd44683ac05c15029d54fbd1ec7ecd8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 11008 bytes

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