Malicious PDF — malware analysis report

Static analysis result for SHA-256 0979564405021636…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 03:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd14f15f487a1674438be832be789aa1 SHA-1: 4d8cd1909ff7120cfa465ceadd13367a7ed14e63 SHA-256: 0979564405021636f2d9067c3daea5e21c87a2442f71fdc4f92880c0aec227eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://gojjang.com/uploads/files/41429812094.pdf In PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/nolerozafizulula.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/80588702711.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/kokajefojek.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/10509163201.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/1161599010.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/bifafabigerebewejaget.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/27955360235.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/54719999993.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/63248736719.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090715553173499.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614847d8dc607---zasukakumolibixebiwetuzi.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/93267071324.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/91689449865.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/tudini.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109151233117065.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tediwilivilesabekibeb.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/93261539108.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a85825f8a---8701436268.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/76395016702.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/xesurowiruwediga.pdfIn PDF document text
    • http://sartor.ru/upload/files/lozogolafitokusi.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/71944840343.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c06ab877---lukivezewugepebakitev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rc19+download+apkPDF 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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 10360 bytes
SHA-256: 5259a44c36036096f5afdc0a6236ada56821faf7c3ad91007df45880ce13e143
font_02_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 17992 bytes
SHA-256: 16d19789d13839d9d2727e90f3835f52a0d6e17b4b7af108fcf33f33246c0e93