Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8683d52bbfa21c9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 10:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69a1cffc5db199ca5589accbe79159c9 SHA-1: c6223d89fcab600698bac3d397d2a9fb3e9ec8c4 SHA-256: b8683d52bbfa21c9b554c97a922f5c756f22ae986c45b29e1e479f3de96ca0ca
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on potentially untrusted hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecb2ad3a89---40245212969.pdf In PDF document text
    • http://kbchina.de/upload/sabasulikorasaxeruj.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/97739484626.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/11985404208.pdfIn PDF document text
    • https://camphacement.vn/upload/files/wasunifuzikurawikobal.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/fifesirajixovikegi.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/kumomu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41417a9bd15bb5690ed9c65c2289daaa/99285593652.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/72741987165.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/88550933979.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/lapodozefu.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/lirare.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/17932832565.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/novevadafudumisiwunenugu.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/86171591838.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/19403142237.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/xorejafazivurafinumituwow.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pofotofipisagazevulejata.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/41850319962.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/xobiwilu.pdfIn PDF document text
    • http://hoachattn.com/image/files/59753780408.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e2ac7f4f5d341bf73d41f0ce5ef2d5ce/fegeleberigud.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/nomupukidenivadalagomusox.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/64888591838.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/riterubelidatipolepuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=zip+code+marinduquePDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 18040 bytes
SHA-256: fa01f05f320e9670f79945c8ef95b6d85adcc9375ec3237332a16d3ae5a2f8e8
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10572 bytes
SHA-256: 3a2281a2805e3ae5b1d5f02384cb08fa33d406f97bb18ef5b1b26fe1c7af1852
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1