Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a3e676786c4021…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 05:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1019511b238e76998a49badbce45535 SHA-1: 80c0a3164ebc78a5f0f981d4beff17df11da86ca SHA-256: 42a3e676786c402119468a628cbf1579e0afda413e4e800b789fa003b3bae29f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. Multiple external URLs are embedded, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://ketchas.ru/uplcv?utm_term=examples+of+paired+samples PDF link annotation
    • http://obkladlazby.cz/userfiles/file/nuzuze.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613794116011e.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210905200024.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/kopegikemorawonokuwojado.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/jawujej.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guwupubidema.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/37890264135.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/wiloxoputizimafaboziduro.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/25789333775.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/53287955076.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/59825252657.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/27732661321.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wolegizik.pdfIn PDF document text
    • https://baongochoa.com/upload/file/53767699581.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/65918324243.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wofubuzomegovogewafanu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/fudipapi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/saxetifagolul.pdfIn PDF document text
    • https://bunianco.com/other_files/File/15963714464.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/41415258932.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/gimojukobodatetanurusadi.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/vonivupaxe.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/suxajolutulugizatukes.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/wasore.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_off0000ba54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA54 10540 bytes
SHA-256: e333107aa04bec21eb94757377ad64c99ed4e923a2e85c438fca8f5ba4204a9a
font_01_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 17284 bytes
SHA-256: 31649b7308f21b495932676cfce92a878c9d7eb129fa349d71e6b98a21a60682

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