Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fe765e272c3c68…

MALICIOUS

PDF

87.2 KB Created: 2021-09-22 21:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63ed3f9717e56893d9e746a98074655b SHA-1: 1266d06eec639cf9cccb4e491dbd27495429bd70 SHA-256: d9fe765e272c3c688e68c7ee5d0616acf8ebfd67d5311a2a305bc69516f5e227
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute further malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=cordova+ios+debug PDF link annotation
    • http://isleford.com/filespath/files/20210905115655.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gasuzabugikikodivibuxo.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/8050522455.pdfIn PDF document text
    • https://people11people.gr/uploads/File/85363246552.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/masuximadepafunawipaxiwu.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/xadeki.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xafubovamakilejurotudekid.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/junigotawolob.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/60722140982.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/27869053376.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/wepixa.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/82186142553.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c8cbd83068f0123f4026a5e4c1766312.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/nowafixiregesopo.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tawidazomodazutaruj.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/ruvupolub.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1841cab25---86208018421.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f52e8281e---ligufonujemuwinezuliwal.pdfIn PDF document text
    • http://labonscafe.com/userfiles/70594036911.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/73721833881.pdfIn PDF document text
    • http://flirdining.com/uploads/files/19777495022.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/37387939406.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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 10512 bytes
SHA-256: 07ebf5aaefb5d06342623d458d27bfc811ed72657fa9ca31d0cd7ecdb6141c7e
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 17840 bytes
SHA-256: 3b970de3a243b658059e3ebf7a5b0965cf4cddab68245332ade63872c9387535

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