Malicious PDF — malware analysis report

Static analysis result for SHA-256 898c943f0b4ea142…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 00:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7978b18b9b880c0c790b83c7b90432c2 SHA-1: 3b9c2bdceea62f6ebb86bed0232da414285399b8 SHA-256: 898c943f0b4ea142b63b19e000bf3328a2f8a9e78355b064bd10bde566f0b156
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm intended for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://didaconcept.com/admin/fckeditor/file/rivirokukoje.pdf In PDF document text
    • http://bscartridge.com/pic/vizudabepoxanebe.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/24552287954.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/tadulodebasibirezogedaxek.pdfIn PDF document text
    • http://badgerhillfarm.uk/10246685764.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/5349546079.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/kavab.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/90488094807.pdfIn PDF document text
    • http://royalgroup.at/tmp/gufimenel.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/mupoxopu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccf0144ea---95131279945.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/82487942298.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/38064548123.pdfIn PDF document text
    • http://yilip.net/userData/board/file/dafukixigijavisuwo.pdfIn PDF document text
    • http://geotersrl.it/file/zuzasewodudujuna.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/73305559894.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/tedobujitetasatalononu.pdfIn PDF document text
    • https://ghnservizi.com/file/90276541348.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/pipepo.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/91523134694.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/20816868266.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/bagoxon.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bf1d9fe967e259bd476a49ef1bf20c16/33261115826.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nonuzulem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shankar+fundamentals+of+physics+pdfPDF 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_off0000b5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 11264 bytes
SHA-256: 64939540aab46a94b37fdac727872afbcfa9ce8e996672b8299733070f0a0ec0
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 17008 bytes
SHA-256: 48c5be9896cb5cd4a27c9dd38e95b54460a6756d184e2d8e2550fbfc529a30db
font_02_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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