Malicious PDF — malware analysis report

Static analysis result for SHA-256 66849284fdbac504…

MALICIOUS

PDF

75.7 KB Created: 2021-04-05 19:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bfc5544febfe0f277f11fc72e4112021 SHA-1: 7073db5347722ce5889f3185415e19089d3c0045 SHA-256: 66849284fdbac5041aee859e037f11b1e4f8c2380fce18ea417e5d3de71c7bc4
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classifiers and ClamAV, as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent, likely related to phishing or malware distribution via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/award?keyword=effortless+english+a+kiss+pdf PDF link annotation
    • http://narexatefaz.22web.org/90777399701.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/ihggd6I/66855528801.pdfIn PDF document text
    • http://fapseo.ru/masewasutudakgb.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/55382972898.pdfIn PDF document text
    • http://org-fruit.space/numetela8owb.pdfIn PDF document text
    • http://damvglaz2.xyz/pocket_icu_3rd_edition15bdf.pdfIn PDF document text
    • http://zomesotemaxage.66ghz.com/excel_text_function_format_list.pdfIn PDF document text
    • http://detonic-italy.website/diary_of_a_wimpy_kid_rodrick_rules_movie_downloadxszbg.pdfIn PDF document text
    • http://goldstein.berlin/96668916308dajkc.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/jiha9ge/frosty_the_snowman_piano_sheet.pdfIn PDF document text
    • http://farvestnn.ru/ledagakamabuzufudukigzqqw8.pdfIn PDF document text
    • http://vovpomnim.ru/pantoum_of_the_great_depressionhlte6.pdfIn PDF document text
    • http://it50disconto.pro/kalamefexapufuduluf580t7.pdfIn PDF document text
    • http://storeeuro.info/92015811776amzzz.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/d0313292-49ea-4686-80aa-1026875b7bed/45047852180.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/blacksmithing_1-_300_guide.pdfIn PDF document text
    • http://donovebar.rf.gd/what_is_the_download_size_of_unity.pdfIn PDF document text
    • http://fakoxogotavure.epizy.com/best_weight_training_program_for_runners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e67426-45fc-4511-9e2b-60a4207fcec0/78636307774.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/sample_home_inspection_report_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baba00e7-ad88-4786-a410-d08d0bf864a1/meriwanujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7aa6efd-75ae-4581-b0f2-c223b7995b11/dalajegereduwutuwexusisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c790907b-440e-41aa-b562-eb39d822cc98/81473634765.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/juzulizejofa.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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 5324 bytes
SHA-256: 675a9b40461ca0c6eb495dcf47aa2e36f50a91901ae15aebe7e4fb3faa916152
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 19672 bytes
SHA-256: 377acffbf3024a12f5b2b81d9528bf5124f3040c92da5a5b374bdeca10b2e8e0

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