Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ded323d0353b3c6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 23:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3d94c42f86fd14a0efa0e8563aa1a8f0 SHA-1: a3579fd1467f8bbc60fe2f286bb6c6f3c513a38a SHA-256: 8ded323d0353b3c613ab14e63f08843652dd5cd94f96b8a36d91bd00e61675ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains, indicating a link farm setup. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection further confirms this, identifying it as a 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to these external links, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fipjp.com/userfiles/file/megezerekunalox.pdf In PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/jumisepixatase.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/72985743052.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/41239329689.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/divunuwakidesesakurisobi.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jowikebe.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/44624872678.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/27287123769.pdfIn PDF document text
    • http://surausa.com/uploads/files/fakomukeb.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/totorek.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/28848303532.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/67d6580135ed613c5d1fada4fd33052f/18566465115.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/gajizozube.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/kegeripam.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/53545921102.pdfIn PDF document text
    • http://gabortech.com/admin/file/kafuponupafolif.pdfIn PDF document text
    • http://orem.mn/uploads/files/tapemi.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/98772979565.pdfIn PDF document text
    • http://gestioniarmatoriali.it/mamuregatete.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/ferifosapadigurozum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watch+love+after+lockup+season+3+episode+2PDF 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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 19024 bytes
SHA-256: bd0ab25607eabe6ea9ea2eeaa174ef57a556638389931b3702484a5ff6b5ee2d
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305D 11260 bytes
SHA-256: 4884da8a6d3eacb699a93ddccf4572363cb073c0993f0f270edd2da88238b261

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