Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b100adbb461d602…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 13:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 386cdf9c30ec8cf34fe8a0c15cb43339 SHA-1: 8e49fcf30a3e11400d95770415d57fb6a7f604ed SHA-256: 8b100adbb461d60255ae97083bf5573e5743717cafe744f865303b600bfa0e5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://philabc.ru/uplcv?utm_term=s21+ultra+touch+sensitivity PDF link annotation
    • http://mottaing.eu/userfiles/files/laxuwazu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46974479703.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kefoguzodogotem.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/62514347709.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/jepunoraxojupezuj.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/mulirudinekojepud.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/mibeliwozam.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/tobanenopababatoxigew.pdfIn PDF document text
    • http://podarox.ru/public/files/96147188306.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84501288473.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/noduw.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/rofuxifexirozosefolu.pdfIn PDF document text
    • https://thegmsbihta.eruditiontech.com/userfiles/file/57003074486.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/85098461293.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/mezixafarolabesakita.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/45642585622.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/zawofofuvo.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/xobepemavobofivosobow.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/18389415360.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/bezokiwalisekozagare.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb4b8a51e---dowabij.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/pimozinokazugat.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615565dfdc792---51763105477.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/xubixus.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nowaxumew.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/pimuduk.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/53725245376.pdfIn PDF document text
    • 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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 14664 bytes
SHA-256: 808845cfb3b1459efc620031ebed729089d8abcc92d69f864aae5e81acb5e156
font_01_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 10852 bytes
SHA-256: 4c3f20121f2affb4e8a8f9256b7779b021f00e4f9781da3b9e4358ccba14c4e1