Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ffbe1ce4c88a86…

MALICIOUS

PDF

91.6 KB Created: 2021-03-25 14:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a08005d1719780c1a283c44e52349c01 SHA-1: 99809ce18d10f40a7bb6290adc893c4bcd8d7447 SHA-256: 18ffbe1ce4c88a86eaaa7d654ae2420f5f1a31dbff9176bd3a23666eb1b752c4
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ML classification and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=the+interpreter+of+maladies+analysis PDF link annotation
    • http://yeswins.space/roark_s_formulas_for_stress_and_strainw5lyh.pdfIn PDF document text
    • http://akb54.ru/mossberg_935_serial_number_lookuph0hh0.pdfIn PDF document text
    • http://dedevolopi.iblogger.org/tutorial_on_excel_macros_free.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/kaxirojobelezopaxelabj8714.pdfIn PDF document text
    • http://idealica-italiauficiale.website/25479308908sfmm4.pdfIn PDF document text
    • http://ru-dev.xyz/gcse_chemistry_ionic_bonding_worksheetbpr2g.pdfIn PDF document text
    • http://form-copyrightservices.com/mogoxilo2kqf5.pdfIn PDF document text
    • http://bloodcraft.online/the_magic_flute_queen_of_the_night_storycbrb9.pdfIn PDF document text
    • http://sallles.ru/11505036026c4bs9.pdfIn PDF document text
    • http://bosegabowatitup.iblogger.org/larididesidukokelax.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/eXjdYVz/zaburofogaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dakusoripujo/9iaY1gi/funny_boomerang_effect_app.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/vosaxizofixutelatedonoymwvd.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/igliajd/99975810721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc1a612-d271-4382-b824-e77837a55deb/how_to_draw_classes_online_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225ee520-4596-4866-829a-cfb6c1583dc4/bifikozoxapesuvufe.pdfIn PDF document text
    • http://wabelat.epizy.com/jegakixugamoxeb.pdfIn PDF document text
    • http://wobazopaf.epizy.com/microsoft_chromium_edge.pdfIn PDF document text
    • http://dawubiri.rf.gd/que_significa_adviento_para_los_catolicos.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 5332 bytes
SHA-256: e53561421d3654af610f839bd116a8c86b383e7d66465994fef569914fd944d8
font_01_sfnt_off00013d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D18 10484 bytes
SHA-256: f5f759bf6d95cda4f52eb34701b1c2e5fab1688bdd75a453761c5f9973eb50b9

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