Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81897e8885d03c5…

MALICIOUS

PDF

86.1 KB Created: 2021-10-10 06:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 832a98bc7d1b0714e0fecf1929da8ce1 SHA-1: 7563f398d59977ffe10634c54237ff580cc85447 SHA-256: b81897e8885d03c56b9bc6d71c36d40af6a58804d8711024b103e650e612af53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF's structure and embedded links suggest it is intended to redirect users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sovaimm.it/userfiles/files/90737740232.pdf In PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219101047491185.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/23712467695.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • https://digiconelectronics.com/media/53724600974.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/3522797834.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/jafizisukumujalonemutura.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/32878725805.pdfIn PDF document text
    • https://slide-bearing.com/d/files/jodomotel.pdfIn PDF document text
    • http://techbis.pl/files/file/24715204977.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/58310846132.pdfIn PDF document text
    • http://haki.tincorner.com/uploads/files/32090715164.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/27683893255.pdfIn PDF document text
    • https://preciseenergygroup.com/media/dosiwupemofepupopanalul.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/jobinuz.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/redogug.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155db505c3fc---logugalavixatipum.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/82980542502.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/xevitarif.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/15206615531.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57260900691.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/jakidiv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1615e21d36ed58---90703127711.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/kajusonixabuvowifasa.pdfIn PDF document text
    • http://bankerz.in/qpic/files/41946922121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sample+of+experience+certificate+pdfPDF 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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10788 bytes
SHA-256: 8cd6ba423e4c332a93ac7a6c4b411eea3b4ef266f9e9cf982bc3f0568442d38c
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 18264 bytes
SHA-256: c12ceb6a5f03d154baa876295354cd6ac699340fb0846df9870b7ddb450e2a0b