Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbac199cbbaa6e3…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 08:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb29c4cfa55a822b244802df6c76b56d SHA-1: 060354a6d3b5ed81087b8ec968bd789104174576 SHA-256: efbac199cbbaa6e3a13b6997298a642fa8ca2651a52f99b179f163e0928b8271
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based lure and numerous external URIs, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/15955910412.pdf In PDF document text
    • http://www.tekkoo.net/images/library/File/minumolipufulekirupazakur.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/85049183192.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jejiraburebotivep.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/3950680073.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/jegovonigilerulap.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/vojamifax.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/sexijaminanuforo.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/gimuliweripekewafidefito.pdfIn PDF document text
    • http://scsytech.com/upload/files/15262897291.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/ximoraxosekifinufuxus.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210909224949_718414779.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/duzurazimit.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zewujiga.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/35452039869.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/riwax.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/86685231109.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/melagebafujulodonetujule.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/31759924331.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/fofufon.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rglbjon8ae59ntbus7cstijh4t/84597181732.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/39112873587.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/58680131185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vidmate+download+2019+free+downloadPDF 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_off0000ae2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC640 13732 bytes
SHA-256: b23110eb9051a763845b02935533213f9665ab6b063884f750eb35fede3867d1
font_02_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 10864 bytes
SHA-256: 60e54fc60d88f1bc3bc84104f1ec142a20b3ccefafb7b4d69e78e441435b93ef