Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd8fe4d80f060d5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 03:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b668858e453bf39cffd64a690981711 SHA-1: 2dad936fe541433e0d2b706d46e098cf7717007d SHA-256: 4dd8fe4d80f060d576b48057fc71d2ae0038de9690d95f2f128ce608485c65f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laptopcuhaiphong.vn/upload/files/90978806425.pdf In PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/xujegewirido.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/bazuximokutavepovisiv.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/xenurifigaki.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kefirupaxufaxowuba.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/8777380035.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/xinivumilebomovigonute.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109060608586808.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/52583934946.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/31411821802.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/85047631370.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d26ab084c4---56740586071.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/sutukusivegufo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.pdfIn PDF document text
    • http://corkpotters.com/images/27938875606.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/tajuwefidaf.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109031605188637.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zofalevadax.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/povafasurodoxupe.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wulifujugakozupa.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/7305478496.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jeziserajape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+walking+dead+season+10+episode+9+onlinePDF 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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 10956 bytes
SHA-256: e8623a7da95c6d47fa58d61aebed2c5b64ca663e970bbcf6dc48381540d8a7c0
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 17960 bytes
SHA-256: f02bce9896d893dabf60d9a564780e03dfd941d5b2713a69a488b76441996943
font_02_sfnt_off000121c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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