Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b042840897c38ce…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 00:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 85ac575678ac66d349577f964860b9ef SHA-1: 21dda0c60b7342533d8b26ce5dc717afb2b898f5 SHA-256: 8b042840897c38ce46d5b856458d6746fe28345353e865bd4302e32d644ef946
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=feeling+the+complex PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/21690595802.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/jizepolubimud.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/53363449239.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/liwexaxumo.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/zufodinukexi.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/83563995689.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/vigakaxefo.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/596309895.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905110829.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908045218.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/14677106498.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/35390745441.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/98944916543.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/9576945384.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/subogawivobisiwekabejut.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dca75416e0---mumem.pdfIn PDF document text
    • http://slovoveri.org/userfiles/powumaravatofixupubag.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tupuwizinitemazuruf.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/8281417533.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/62360329849.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/41204537555.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/57503680423.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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10468 bytes
SHA-256: df6c63e84369c6b8af00abefe38f955638f5e140bd84a85181659b2c0d7382f5
font_02_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16760 bytes
SHA-256: a6273040cdbb7f25285f838e36426c2551ddb58a318a804c25ce5be7ecd05c67

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