Malicious PDF — malware analysis report

Static analysis result for SHA-256 79627c820187feb9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7cd2d8b046e55866d2d08d568206029 SHA-1: 321c2a85d388c01164d5292385941f305ac72c1a SHA-256: 79627c820187feb94416eb171106dad442d5921f4adf3ea859168197c4d02ae4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=vce+further+maths+textbook+pdf PDF link annotation
    • http://glassick.com/userfiles/file/15757391869.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109030930029966.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pumusikaboga.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/dodexijalatoledofewaxadi.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210903074815_g5pc0j.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/73693244627.pdfIn PDF document text
    • http://househouse.it/userfiles/files/wufafaj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/23f16e2af85fb301541a8f9630a5a42d/87879027144.pdfIn PDF document text
    • http://mutitar.com/user_img/files/dizipiforede.pdfIn PDF document text
    • http://gtshotel.it/images/file/32417702506.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/liwadava.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/goneba.pdfIn PDF document text
    • https://questyme.com/userfiles/file/26470575108.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109110831338570.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/suwomewanuzowusid.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/telopulomotajefopep.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35283768038.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/32944898664.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210915203544.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/vegavowavixurapafo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-15/20210915221109607142.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/43217402135.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/fulita.pdfIn PDF document text
    • http://abworder.com/uploads/files/kotila.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/9675225108.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_off0000cc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0F 16552 bytes
SHA-256: 3c036a7941632f72c7b569a31731217841bd73d59ad4de9266f6ef6cac644e87
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 11044 bytes
SHA-256: 802a195283c1fa7ba165fb53dcc896ca95388dd718c3b785dc26035b5b235e7d
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1