Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3ed6edef7aaa21…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 01:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dcae66f603d87b4fcea3cf4c203efe5 SHA-1: 61a2133b85b0df500166163dc24437f5c8305c0e SHA-256: eb3ed6edef7aaa21be15bca64a302f7083de2a1bb6a2119b5543378c721b4932
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random and disposable URLs. The ML classifier and ClamAV detection strongly suggest maliciousness. The primary attack pattern involves redirecting users to external, potentially malicious, PDF files hosted on various domains, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tuzvedo.hu/elemek/file/tobopewusozekufunejiwo.pdf In PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fapatapibifumomu.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/66539702313.pdfIn PDF document text
    • http://baove247.org/upload/files/wefut.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/basiwodivotesad.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/28488690347.pdfIn PDF document text
    • http://www.toptehnik.si/images/18716731708.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426fcb92885---bixikeketudanikedapunita.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/14977445412.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77b31f6f---82836535750.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/kawugolajiburinizokin.pdfIn PDF document text
    • http://grotech.in/userfiles/file/13676335467.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/vewilatodex.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/paxojido.pdfIn PDF document text
    • https://e-room.co/userfiles/file/rulefolaxarisabupo.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiverujeli.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gotepokilenazatupepud.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/nasozituxemufagewezatiso.pdfIn PDF document text
    • https://kokomanis.com/contents/files/94292398638.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/19704189932.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/xatowapofikonexidalusenev.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/lubajovurajalitu.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/10282092738.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lutapegirupisigi.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/mubaxopidikabakaxubidoxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mortal+kombat+2021+leakedPDF 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_off0000c150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 10564 bytes
SHA-256: 1c8611e5acd14531c23aafa9226caa5c8caa81f7f4c5460c7f150d93eb72c390
font_01_sfnt_off0000d985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD985 15940 bytes
SHA-256: 4170f4a26aa499fae25cd7cf2648abe3fe26424bf9d80de6740d7b99341c3eae
font_02_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1