Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa75b7681c43bff1…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 18:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d0ced2281e42b1380e6bd58f3c169b1e SHA-1: 4cb44f9920f2361d6eebfeb15ebbb2276e881210 SHA-256: aa75b7681c43bff16f6c6494e16636fd113088aaab2f96f5da08f61b9f7eaaa9
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'prepositional phrase worksheet fourth grade' and an external URI pointing to 'https://vilenefex.ru/strik'. This suggests a phishing or social engineering attack, likely using the worksheet theme to trick the user into visiting the malicious URL. No scripts were extracted, but the presence of external URLs and the nature of the heuristics point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=prepositional+phrase+worksheet+fourth+grade PDF link annotation
    • http://ketorebagibof.22web.org/song_of_solomon_quotes_wedding.pdfIn PDF document text
    • http://fojenuf.iblogger.org/path_of_exile_oil_spreadsheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixuzo/android_16_vs_cell_jr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f063be-884d-497f-8ba3-5fbae6d08f86/26647314252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78d0957-3c79-42db-9eeb-4601715c5d0d/philips_avent_scf297_05_microwave_steam_steriliser_bags.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_711761240976497384e160bd8140bcf1.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_2f2510719ed24ba5aeee77619ca7a5a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wegugus/49056832565.pdfIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_421e1f0194b943a8b7355a30382f4e90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1615634-12f6-487c-97e2-989be9a71b88/36677273295.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/xadegegetogixuluju.pdfIn PDF document text
    • http://livikunaxexo.rf.gd/86367290062.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_1f1a9c6fb0d4412cbbc8f834123f86c2.pdf?index=trueIn PDF document text
    • http://winukuso.epizy.com/wd_my_passport_vs_elements.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/c_sharp_programming_tutorial_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/81908993107.pdfIn PDF document text
    • http://peromur.epizy.com/is_elder_scrolls_online_worth_it_2020.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_93e60b4ce6b348169c952a370651af27.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_05a58fde3e1b4079939a520b968cc0f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/752c7418-c48f-4ea5-92e7-d346278751af/asus_rt-ac68u_firmware_changelog.pdfIn PDF document text
    • http://jujonejetas.epizy.com/tojoxigupusadeferisufojub.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/what_foods_detoxify_your_liver.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_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 5460 bytes
SHA-256: 7ecfcf73663fe1b8e48ac3ba39886957d0f7fd15580e5928659b651aa387b145
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 11700 bytes
SHA-256: 9e4ed536b8cab782e1a59494a59429cb1b617b5d6ced3d7cb1c00ad62ab8f971

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