Malicious PDF — malware analysis report

Static analysis result for SHA-256 94add2bb66ab9b05…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 12:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0de03ab9570777075735bdfa941cf633 SHA-1: d2d304af4ca437030814b8b8ceec9be46341fc81 SHA-256: 94add2bb66ab9b05b9797266aa30d7318aa2bff3ef981706f95b7cebc7f1dc46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links to external PDF files, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and numerous external links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://anduong-nhatthanh.com/uploads/news_file/12760994399.pdf In PDF document text
    • https://arbormaster.us/uploads/files/65906185210.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/44708018671.pdfIn PDF document text
    • https://robodom.si/files_vsebine/rapegugegasiregetusudev.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/buperakufepora.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/41781400319.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/94792684992.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfe8b7cbbd---volabebimesizoruj.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/70586273002.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sugifop.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/36386365630.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/74914928941.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/bonojawisikidix.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/moveku.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vavilopasi.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/71307202130.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/guvidujumijijevuniputon.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/vonave.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipudopepozazer.pdfIn PDF document text
    • https://taperagi.com/contents/files/suwilidoxamomuxipemozab.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/fuwezegafimaroxof.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151773f9d6ee---pezofifiduzubivajiz.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/gugukakisanovuvajosonineg.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/porixubefokipazipodo.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/zojiboruzubef.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/lavuwurosuteze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+tv+install+apkPDF 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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 10392 bytes
SHA-256: 6a999603325ce20ad6f96a9c55d57cdbdda09d30d918998b015d5a18bf96f273
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 15728 bytes
SHA-256: ff1a65d67b66ee42ea1d240213a89f7e2e3dc9ccf0a1965a484bbf0cc3f95fed