Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0eab28675d5672…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 13:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1c08dca67aafb575bdfb97fd1bc07f2 SHA-1: 90dbb15340d0acd72b37a30b3f5bb685c69713c2 SHA-256: 8e0eab28675d56728f5692eb8a27e1e3ee892b7afe351697caa01ff09a42705a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wedooverseas.com/userfiles/file/83163317358.pdf In PDF document text
    • https://superchills.com/userfiles/file/77664036109.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/76268601768.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/fugibiwulufizuzikelubabu.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/mivexuwe.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/buzal.pdfIn PDF document text
    • http://chongros.com/userData/board/file/57391646509.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/32810935347.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/xamavure.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/kuvalisezepafi.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/sokemazujozonoxem.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/buluxatawok.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48219059624.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_074948.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133614f8244a---pukowewodisevaj.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060603503778.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ruxogu.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/loxosekopufovameguduv.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/serojiburazeseki.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bemuripumawiwudapiraju.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/3453148576.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/84358726888.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/rowubiruzivoxokaravipej.pdfIn PDF document text
    • http://aquatherm-graz.at/files/xugepejiduxiwe.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/23214746787.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136207326d7c---1084084815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=free+pdf+printer+driver+windows+7PDF 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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 10464 bytes
SHA-256: a043d2868cda27cb582ff07d4fce46c8b3406bc4d0fc867ac25cab376361520e
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 18148 bytes
SHA-256: 4242d38d74382eccf0f1d295b8f424746d22702be90f42e14d90d198797cb4e5