Malicious PDF — malware analysis report

Static analysis result for SHA-256 744b1ed2623b8d00…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 08:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bedd42df227fb4e2e16471155e794970 SHA-1: f07612e99f82446c7571bab8699cdb694637e5a3 SHA-256: 744b1ed2623b8d00d8c88c8892a01bb01c335e96165fa047d289621e2440057e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://keluargamimpi2.com/contents/files/jewagizovisavinibejemuxad.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/nefixebo.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/vunirafamenadu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///risufituseforusogasomu.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/52049878471.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/zofugipopuvu.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/20883349823.pdfIn PDF document text
    • https://bem-sa.com/img/file/16235347259.pdfIn PDF document text
    • https://windsbs.biz/files/file/95603635046.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/vulixetafuvo.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/wevegelisuwibogaxane.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/75693080212.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f67c4af27fd2a49532df9ef924ce1f9c/fekovilavodibapuxufun.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/nalarur.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sixesakitudamezozutibunu.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/mafaraxusipavozake.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/baxix.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906180323.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/duxixabate.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///64315928394.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/3278744326.pdfIn PDF document text
    • http://pedraferro.com/files/files/80478415489.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/jumati.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/18472354366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=descargar+reloj+para+celular+androidPDF 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_off0000bcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 10820 bytes
SHA-256: 1a52c335f14f1395e3eb7459b0d6c3ac0f109a93c222f3c1ed05a445039826e3
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 18396 bytes
SHA-256: 624c973f31495b20a1d46dfa742f473422adb28b459a5cc12c6ece6f4255211b