Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ce006d3b9ea87b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 08:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27d828728ca0d502833c021ea0654791 SHA-1: 87345470c8fa6bdcc2faff77b5ecfc9b38539109 SHA-256: b6ce006d3b9ea87b4ec36a8e8f67d9cad10f308c05b9b24fcd6b293ba8f735f1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/rafazixeli.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305eb5f2ed3---64414706775.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/50814894016.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/84860640454.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/60247994664.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/62755009342.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/35399998582.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/7488693354.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/68819904665.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/24943815740.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210909134506.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/suberelususab.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/bezulaj.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/75489380310.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nelokelitipawiv.pdfIn PDF document text
    • https://mkontakt.com/dat/file/99863637950.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/jujugibomorimiriwosotun.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/86106654700.pdfIn PDF document text
    • http://hexindechem.com/upload/files/jibal.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/detigamopokixip.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/39944584914.pdfIn PDF document text
    • https://terracell.pt/images/file/65371976027.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210905110219.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/tigujexage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=scan+barcode+react+nativePDF 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_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 10432 bytes
SHA-256: 009fb68588bad268880a43d259f964e15e34ea41c2da0c3156205f8c9a50dccf
font_02_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 17268 bytes
SHA-256: 74928119fd2512b45c4c6019323fd753a1ec5f1da7db44d118ae0097b50f76bb