Malicious PDF — malware analysis report

Static analysis result for SHA-256 04eb6305b5291f89…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 11:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1df9499dea6eab26bbd5af9d581ebe0 SHA-1: c4aea82c0f68799c78776c69a0a4161ea255e99e SHA-256: 04eb6305b5291f8968860de0db083cc66da86e0951184afef4537d17158600f2
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to be a lure related to academic syllabi. The presence of external URIs suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=bsc+2nd+year+maths+syllabus+pdf PDF link annotation
    • http://rufawefojag.sportsontheweb.net/kptcl_recruitment_notification_2020.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/how_much_does_a_baldwin_baby_grand_piano_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60481bce3f6a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_6014dd4ab006e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5fe3c31363661.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/worthy_is_the_lamb_chords_g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6014c805570f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_f7df2e3dd5554a91bfa3f3372398a3d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/27187673447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eadce517-1b93-4612-b2b5-d077fc1e59d6/patuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783f321c-a200-48e4-aef6-7bdd1b7d86f1/bisizadoxibari.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/4236491464.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_cd6740d68835442b84a604c7ccaca296.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/diabetes_australia_dietary_guidelines.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_e2b6b4c6f8174b38b539a4126bb5463a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8894ce37-cce2-4bbd-8d95-f3750c6479d7/how_do_you_share_your_birthday_story_on_facebook.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_df83cfdc00094534bec744eb96ceea27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4024bc6-9891-4424-af47-ce4a0bce0420/nixon_watch_band_replacement_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c123a9-1df7-4160-9bfc-d07d49c8b3d4/zosinunosuxisimuzife.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/what_is_the_role_of_table_topics_master_in_toastmasters.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5816 bytes
SHA-256: 32c12e6c38e1e3c053a6f41a1893824797a39bce48849e3b1c2f300d4c338e16
font_01_sfnt_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10156 bytes
SHA-256: e48e83ae43102d928e24be455dc95fb203629d4f2b39b889196e3ab34814db93

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