Malicious PDF — malware analysis report

Static analysis result for SHA-256 87704fe0ca780e73…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 00:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 514a71c173851497a557c55e77fb2cc2 SHA-1: 0fedee1693edfba54900433525f90e1dea0040a5 SHA-256: 87704fe0ca780e732669c8dce9c04a6a8a12d35ee0ebc5c437386387418af859
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, with one pointing directly to an IP address, suggesting an attempt to host malicious content or redirect users. The document's structure, being image-heavy with minimal text, aligns with common tactics for disguising clickable links that lead to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jiin-torng.com/uploadfiles/20210918114359.pdf In PDF document text
    • http://canxetaianhduc.com/images/file/netolukawexutimedaviboli.pdfIn PDF document text
    • http://tradotel-riviera.com/file/nugipuketebotog.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16139b43b36f86---vubesarebixemuvan.pdfPDF link annotation
    • https://cecprint.com/images/file/9614593372.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/18625039029.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/vifegijanabapoxidafiwi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c0639dcd219a71640888063e2523a66c/fovun.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/sidakasu.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/92434121243.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xuguvo.pdfIn PDF document text
    • http://grupophi.es/uploads/files/pafitixirupuwigij.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161364b9b54764---varixugasovove.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/lavojepaxefosixi.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/84487592847.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/sowupojudujekabaz.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wibujuwezoguxekelukaza.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/9097300735.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/vofirawenar.pdfIn PDF document text
    • http://krupongs.com/images/file/zowuli.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/roranatapawenunore.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/tufusetenujesujimazolepu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/xularovikafisove.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/85657080390.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/bitamubazojuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+11+issuesPDF 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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 14108 bytes
SHA-256: 66e40c09ef8d931520aeb8f809088f867872c8b3ab0cdd7f2510e0c674956cd6
font_01_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 10068 bytes
SHA-256: c08066ea24314c7157c40f47e2faa586c32df19332e2879d6f6a68dfdbfb4a91
font_02_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1