Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8599ffaa2412a6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 06:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 007f810851e7115b70d05e60649e7048 SHA-1: 0322f5c7e8b4bf75977405176770a547ea1dd7af SHA-256: df8599ffaa2412a611f179087105488508a67f59fb8259947511ce3de3aac2af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous embedded URLs pointing to link farms, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit PDF viewers or deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://positiveforce.in/uploads/files/37919663922.pdf In PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/ruwonujudolenij.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/15658003527.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/favaketeriwuzu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gibafikipubanivijedu.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/tizuj.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca421a4f6---vunikapuzeneduxepitewu.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/metikoronan.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e2c524ea---viwigakideripukot.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/97471554434.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/20959579984.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/15789138225.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/32103966852.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sedezaxilakaxokotagulimut.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/20334706970.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/74106271164.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/71729830492.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/3150641544.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nominoderawumulefexaf.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/3074585840.pdfIn PDF document text
    • https://digireg.nz/upload/28670413612.pdfIn PDF document text
    • https://producto.works/userfiles/file/552063777.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/49962503956.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/fuzadav.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/26271492752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mha+season+5+dub+onlinePDF 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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 10512 bytes
SHA-256: 210148e6d0fd4c2db3483e94c336c75097644b338503e342e2a3495fec476cdb
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 17696 bytes
SHA-256: fc698368e19ec18fa080dedc7aaa0c99457dda41cf2fbd4c576a9ca342ce3f31
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1