Malicious PDF — malware analysis report

Static analysis result for SHA-256 12403eae81d3778a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 13:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60fd032da1591bf77b3277237db6ae98 SHA-1: 0980bd769b335b58d2e5759cacdf73c0cbd2d46c SHA-256: 12403eae81d3778ac92006f05f7a0b0f5acac76fb69dead40fc1457b0a2ae560
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates the document's purpose is to host a large number of links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=convert+feet+to+radians PDF link annotation
    • https://n-v-v.dk/userfiles/file/60877290040.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d1ff349d1---depixano.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/2435821378.pdfIn PDF document text
    • https://brod-plovdiv.com/images/muvisavurofo.pdfIn PDF document text
    • http://pi-consulting.ch/download/mojinoxo.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210913151745.pdfIn PDF document text
    • https://5uempat.com/contents/files/88906365939.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kesatadosomobo.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/49752801659.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/64216052068.pdfIn PDF document text
    • http://sayarbobinaj.com/file/27787444844.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/23012041398.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/fosefofavinom.pdfIn PDF document text
    • http://spbi.cz/res/file/84833550104.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/dosupore.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/fofalugubofegitubig.pdfIn PDF document text
    • http://araratmebel.ru/img/file/95252520593.pdfIn PDF document text
    • https://tuinvandecruys.be/file/47550366430.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/mamonopusuzukupiwowida.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612feb607455c---58886201322.pdfIn PDF document text
    • https://sapporopools.com/contents/files/92676122738.pdfIn PDF document text
    • https://ubranni.com/uploader/files/xaxumufifowuw.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_off0000c1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D6 15964 bytes
SHA-256: 90c8a2dc22876622c55609115c40c68c23d967c17563ba36cbfa947176d38fc0
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10400 bytes
SHA-256: 6c2e37e7b430e38268e1241b6bf5d22c04fd633ba3c131a4baf65008657c3e2d
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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