Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef04345120001aab…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 08:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67019d7c5d6e9aff7f919aec1b29e898 SHA-1: 5a39a9ce2574219e7868af27537dd95410d922d0 SHA-256: ef04345120001aab161133e8705cc856839cba270f720ffa56564d6537086702
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to external, potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=how+to+stop+call+recording+announcement PDF link annotation
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2c1230569b8f59061b4c9ceab5332e0f/32164336627.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/doweni.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kezimajijot.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/voged.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/40110973247.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nugedamorasul.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/ruxasegazurexazesonofazen.pdfIn PDF document text
    • https://nls.vn/upload/files/26390941741.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/690716445.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/64291030008.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/68503294671.pdfIn PDF document text
    • http://lulanjina.net/upload/files/banuvonodogefifa.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/64283471746.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed43b0cd55---taniwukesi.pdfIn PDF document text
    • http://becucci.it/userfiles/files/baxegosidik.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/64704893450.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210903101350.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/wewabanaw.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/12658909506.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/2430142003.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/tosuki.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 11032 bytes
SHA-256: 7f6af3409f4c3db3b3a6020135036f4b13803c44d0ceb7b2d0ff92c83bd66e2e
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 17648 bytes
SHA-256: 19117c1687c8e21defa6b6250e7bae1cf2948b1847e0106dce0cd3af05548647
font_02_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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