Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31ba3032a164b9e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 15:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35b7f23f4f506433a2060865ddae7680 SHA-1: 20d9eb76abc3526f62c141a95b17aa22a0defb51 SHA-256: c31ba3032a164b9e6c729eb2ff02eff01a958ae624029811b9e9f5e1414d7276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external URLs, many of which are structured to appear as file downloads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=user+profile+android+studio PDF link annotation
    • http://bfr-bialapodlaska.pl/userfiles/file/sewakal.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/81100581631.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-15/20210915233334907685.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/meluvenalov.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/vureduf.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/46478299618.pdfIn PDF document text
    • https://tuinvandecruys.be/file/97199319060.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jotarokidaraforejaviwix.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219171433391780.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/kisabeguzozogixozevifixij.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/58028949838.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/3878706931.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/vuxifowepofulaliset.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/33287937865.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/runexozo.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/kuzigisosovoxibapagoguda.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/98165975605.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/sodizewedudejumawidotam.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/98684525480.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/vobezutebuwenanuxivegemo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fb039579---48359982741.pdfIn PDF document text
    • 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_off0000b6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CA 15600 bytes
SHA-256: 9a6906adda30bc1de4e49449c15c5705544b758731d627c739776f925f83693e
font_01_sfnt_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10600 bytes
SHA-256: c8491b39ab58e5bfa9c2f052fee4d0f3f336a25dfda3040c33a8d01148d75b0d

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