Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8a25cae1e1a430…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 22:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4146d92387c75666bd85490f8344159a SHA-1: a248524765d1d113deaafff004dbcb24baa4ff84 SHA-256: 7f8a25cae1e1a430ac5e8aa63ff3e0ac4640d738855f8ddd8c2c0cafb8295b44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The document body is heavily obfuscated, suggesting an attempt to hide its true malicious intent, which is likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://bluecars.pl/userfiles/file/29554133415.pdf In PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/81620963756.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/46728228015.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/72065936785.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/27891330480.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/kosapawuwegerofofizip.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagerakerigewedofiwogof.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/volenofunijezivafaseno.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/73556627521.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/tabumejunugaxovep.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/26620569648.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/73931184901.pdfIn PDF document text
    • http://potlista.com/file/files/98094032959.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/duxodalulanedanime.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gufadedanoz.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/fitepitisuzonidunakelo.pdfIn PDF document text
    • http://rubensova16.cz/files/file/gejitasovon.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/90202056572.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/fuwawitizomepipati.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c0863cba---tusuxokaluripos.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/52689415338.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc7d4571---9423334805.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/mibagatarido.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/zamuxikanepawubimunuji.pdfIn PDF document text
    • https://parkettworld.com/upload/files/vemebusunage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+games+for+android+2021+freePDF 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_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 17284 bytes
SHA-256: 76b061c910673133b45e1f8c9500f330bc785f2c2128d9874e5af526d7fcec69
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 11000 bytes
SHA-256: 41093abee7ebfffb8a25325d420fa703a4013f174baea210bfbec63e2280df2c