Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe3e878293af626…

MALICIOUS

PDF

85.8 KB Created: 2021-09-22 10:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48631848bc205f07bb2ef5264ffef155 SHA-1: 949f039371a9b68af3480b0567db06a546871db4 SHA-256: 5fe3e878293af6268cbe2318209953a473d541d10ae30297212a233033ccbfd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kiddeefire.com/media/userfiles/files/femosazeb.pdf In PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/lapafofebiwexapojizipofi.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/42510781083.pdfIn PDF document text
    • http://orlickachata.cz/files/files/vuzuvewategoruvusobokirab.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/18594547962.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/46696637503.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31026872547.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/vipikonebevumifulugusuka.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/56578099956.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/26693134188.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/58d1e6ddf23e6b330930c58a2c237b14/vogafajef.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/70250471350.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcdd29b2e6---pejikogatuki.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/nagafa.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/nomepigazimapimolagor.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/jezifuvasu.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/xerusupu.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/dopafavomenakivawajepivik.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/kozapozofofewigolu.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/44860889284.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/bokenijefotugami.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/10618145279.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/94948431038.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/51712870234.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/tajebodug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=microelectronic+circuit+design+5th+edition+solutions+pdfPDF link annotation
    • 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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 18488 bytes
SHA-256: 2834e50c7e1e2754cd36cafb3e443b48a66016b06705ec50cf16c7ee3cca5858
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 10964 bytes
SHA-256: b8787b57182b171e7cb45457fe3492187df380980b3b2e7f1f3bba5c608e647c
font_02_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1