Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aa055729d4ea2f…

MALICIOUS

PDF

77.7 KB Created: 2021-04-15 02:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ab24ec116662b0309b7ede802165045 SHA-1: b4126ceaffe7678669f9803986b294771ce06ff1 SHA-256: 51aa055729d4ea2fd2a256f3cc3467ddf9742d5b1899b6a24c32bffae6fb87dd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'midufefew.ru', which is likely used to host a phishing page or download a secondary payload. The document body, though heavily corrupted, suggests a lure related to an 'español latino online dictionary'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=diccionario+espa%25C3%25B1ol+latino+online PDF link annotation
    • https://cdn.sqhk.co/konafomaz/eW07CfH/zaniridawarimerolijokez.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/ghicgfB/bujemutodeluvumipukewoz.pdfIn PDF document text
    • http://amsidgi.xyz/40771587689kne33.pdfIn PDF document text
    • http://zalavsky.ru/noam_chomsky_sobre_el_anarquismo4vnpk.pdfIn PDF document text
    • http://meriline.store/diablo_3_wizard_build_levelingg84mi.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/hfnYIjg/did_you_know_amazing_science_facts.pdfIn PDF document text
    • http://solapp.xyz/juvene2102y.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ehdTihe/dunetapevazisi.pdfIn PDF document text
    • http://cherrypimp.online/buxofirogumikatotan3tm.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/lixasifasi/avmatrix_pvs0615_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd1c11f-1332-4427-88bb-016035dcec97/banach_tarski_paradox.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/background_sky_blue.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/pexak.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/is_a_series_of_unfortunate_events_going_to_have_a_season_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e9e90a-3ea4-41ab-a419-0709e963188d/tepamok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d93cb5-42f2-484c-b492-7fc6d1b33546/how_much_oil_does_onan_4000_generator_take.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/beats_wireless_earphones_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1a20b1-11d4-4d94-88f6-3d87f5e55cae/samsung_galaxy_note_20_ultra_canada_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3582424-a036-4aea-ab60-4ada4a609405/axiom_61_driver_mac.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5136 bytes
SHA-256: 7fbe8ebbb3ce1c312be022da43722dd0028eaa38913031d2d6bb71868a51fdb0
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 13564 bytes
SHA-256: 4b89ca596cacdd149daaaf53943525c466ca597d745bb2cec9ddd540ea0401c0

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