Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5d8412032f8b87…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 17:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 59fc4a20cbe4c069d91e2c8b01286d8c SHA-1: d5050d949ae7545594ae9a22f624a8f9d5f7c79e SHA-256: fa5d8412032f8b87b913a240a154e918a0e6f8e3e8e0d8c7fefdbe50ff03c49a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ajansnigde.com/resimler/files/79272966727.pdf In PDF document text
    • http://ctcinsulator.com/uploads/file/salixojugifunogati.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/28885668766.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/wezemarojijanatulavilapa.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/dilusasadejanenunikexig.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jelaxopekijorumiv.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/wibogopurirepusilof.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/31287682799.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413dac27905---puwojedob.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gibogaregif.pdfIn PDF document text
    • http://eventechsite.com/files/files/52961128610.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/23679099803.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/84179530225.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/ximib.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/81375986955.pdfIn PDF document text
    • http://artepcb.com/upload/files/23930910464.pdfIn PDF document text
    • https://ms1oke.com/contents/files/nuzudafubile.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/90416497053.pdfIn PDF document text
    • https://lasanisports.com/files/52135275137.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/77421274767.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/40173339020.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/84988361877.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/26775799631.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/46029290084.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/fojarega.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/sejomivibafuwinot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+play+pokemon+emerald+on+androidPDF 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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88B 14896 bytes
SHA-256: 4de75fe5ba72d0f57d9fa34c4160c2092b8b171c73ab15d6aebab42e4b7962d0
font_02_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10668 bytes
SHA-256: 59b47a394db6d7124c28cb37d5a5c97b5ee00da95d7dbb4c4d96e361eeb6652b