Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6147e457e447976…

MALICIOUS

PDF

99.9 KB Created: 2021-03-30 04:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 52d969845544341ece8c6108777572c6 SHA-1: 51fe5bdb684c3118227057be0c63cd453fb6864b SHA-256: c6147e457e44797615c7384111b56e66998d441da773da55141bdfa75b538f03
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/123?utm_term=4gl+informix+code+example PDF link annotation
    • http://kodesurajevo.iblogger.org/encyclopedia_of_general_science_english_paperback_arihant_experts.pdfIn PDF document text
    • http://safilow.iblogger.org/cc_mu_powerpoint_p_mien_phi.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/M7uDgcP/sexivosetusozegukoga.pdfIn PDF document text
    • http://gagejunifux.22web.org/79359135147.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/jjljcji/derwent_pencils_review.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jgilgjJ/xalulelazo.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/d2fs7ig/carry_over_addition_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gILje88/zarelerijona.pdfIn PDF document text
    • http://selasudopudisom.iblogger.org/suxugotubobewikodigapafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7c02ae7-ba66-49ef-8fe7-d4c265c54a1b.filesusr.com/ugd/bc5701_a270caab300c488b8cfb63035bbc2262.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_e52aab3c014144ba8271ec4bc609be4c.pdf?index=trueIn PDF document text
    • http://wulumesa.epizy.com/55608845858.pdfIn PDF document text
    • http://rufazigivemebod.rf.gd/opportunities_challenges_and_power_of_media_and_information_in_economy.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/murafesimabuxole.pdfIn PDF document text
    • http://sofujupoxalup.rf.gd/chemistry_a_molecular_approach_solution.pdfIn PDF document text
    • https://2eb5e741-fe40-4e13-9a70-20af0821b154.filesusr.com/ugd/6cf56c_6ece7e29ab6c4236aa7b2fe0182ef9ac.pdf?index=trueIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_8b5f22917bdb49928f02b6b9a3d187d9.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_9791c5fd39bd4cf989845bd24124c1b6.pdf?index=trueIn PDF document text
    • http://lojonawaz.rf.gd/91367857373.pdfIn PDF document text
    • http://gikosetopetidun.rf.gd/new_dubbed_movie_in_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/what_is_the_order_of_books_in_the_alex_rider_series.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_7f33dc378c844ae88c780ab41c1e317b.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_111ea66264f44f52bf8131dc6f4f06a2.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_dd93bed265ae4e64a47ab835a7c606e1.pdf?index=trueIn 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_off00014622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14622 5360 bytes
SHA-256: 65be6729c3923bfb1c3282b033d84ec4e180a1f8135390505de40d8d70ff6f6a
font_01_sfnt_off00015854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15854 12664 bytes
SHA-256: aa1b29d11374200148d449f46bd0164a2082d6635a697b76450972e9e89dc108

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