Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb08693d9704a778…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 16:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ab209544b8548a02c34ee4cdcc9ac0e SHA-1: c2b90b332ad1bf00b1e1fda9ce8c60988f598e1b SHA-256: fb08693d9704a778cd73692391c335707475b57d5ad1d010b948718d56a95f94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://unicon-msk.ru/data/files/masoluxexomibasufal.pdf In PDF document text
    • https://warungmimpishio2.com/contents/files/44625139399.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/dumisowikos.pdfIn PDF document text
    • https://websbag.com/uploads/files/monoxopufadasakopofin.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/18737174200.pdfIn PDF document text
    • http://kmsenior.org/file/files/40049836943.pdfIn PDF document text
    • http://robedecreateur.com/img/files/rakozuvofo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/kupazadotevofekufiwotiw.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/14658079041.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/zizekavogo.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/xewevelipelulagum.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/67222970593.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/wokubakumukili.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/94245746584.pdfIn PDF document text
    • http://glttek.com/userfiles/file/zuritisedurupujitowumunab.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/virujetaxazigirowilezaku.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/batexukexojavi.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/jafoketotixivonanoku.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/leferotinirezo.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gifiluzetodosirenosiwigod.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/kopawaveletesarotavesa.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/74023290300.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/53678128880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tower+tycoon+codesPDF 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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 10224 bytes
SHA-256: 74c20bdfbaf0fa973d2637a027c9bc6f076a29953ab015da4c492dfef9c3ca9f
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 21056 bytes
SHA-256: dee7dd7277bb615e3fc27031d78d69085faf8e9468558c4c0ab7ee3719931d26
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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