Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd8ce61586e203f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 17:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c84f6b2036ecf48d7e615c55bf860f4 SHA-1: 91b37104524d4235d2b090987b4148755a9bb213 SHA-256: bcd8ce61586e203f3859896f2a116158b08b18b5ce6b41b77fa17e56c49e64a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, with one specific URL pointing to a PDF file. The presence of many unknown URLs further supports the idea that this document is part of a campaign to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145625451a40---zaxafuxagawofezimebawawis.pdf In PDF document text
    • http://qiuyutv.com/userfiles/files/20210910102811.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/nadidexarinovuv.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/85404244664.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/21711532954.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/vikenemazufelajuw.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gopemawubotad.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/papima.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/ranevajutanegigirivu.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/32021743740.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44119523334.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/17291421891.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/wigamuwafimeradunilewoka.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/82444256159.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/bediwivorugan.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/88543149072.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/30126566760.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/82739332764.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///dupegudoxotefimudulemodi.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/82299614972.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/98005537430.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/soxavoseke.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210919122221_6xio5l.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/sugozirapitir.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/2320130713.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/tixori.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/29642392083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=war+for+the+overworld+cheatsPDF 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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 18340 bytes
SHA-256: cc51bd4d9d23ed8cb8c15d7cb602c940cdd817ed1c97391f2c71abc3995903a2
font_02_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 10524 bytes
SHA-256: d2a24f7750bb65c778c6c57f755c3bfedd31fb65803f5efe5dbd72f6fab6b2cf