Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b4bc7fea3d8586…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 01:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cb009dd98d70d8a5ee9950a09423009 SHA-1: 10ce027a04c29176c38f3e8452d1a5f7ef575eac SHA-256: b4b4bc7fea3d8586bae9d9812bccc2c82a624f777240ff407a5f2884937530de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous embedded URLs suggest a link farm designed to redirect users to potentially harmful sites, masquerading as a source for free Android applications. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://efeotokiralama.com/Upload/file/jiver.pdf In PDF document text
    • http://bagiez.de/userfiles/file/sonifuf.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/5814256168.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jigefobakagidizopezi.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/515594384.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/25036804167.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/88167976026.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xomezofemoputelotutebu.pdfIn PDF document text
    • http://only-svet.ru/upload/files/bupokuz.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/54391719946.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/71837872854.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fejaxisujawibudule.pdfIn PDF document text
    • http://khocabien.com/uploads/files/83726803491.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/sanadawaveguzol.pdfIn PDF document text
    • http://p-energo.ru/content/file/nugaluzuxodakivaxama.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/zirowatobud.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/warekapuvinewezoboripan.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/s887iqs4shkjvr921sketltmg6/goleve.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/54190686632.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/nutaparuzubimatolesobosi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e3a2395---jujukomisegiwolemigim.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/mixari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=descargas+gratis+de+aplicaciones+androidPDF 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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 10692 bytes
SHA-256: f2101fa9f9ee362fac9f6670efc1846dc64e86f7f38ce2e259748dde7395c93f
font_01_sfnt_off0000ebdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 18976 bytes
SHA-256: e0fc4d6a51501e4325623b0283f8a1e7736ec9a7061be2bd954fcbf14620d2fc
font_02_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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