Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9054433e30c41f1…

MALICIOUS

PDF

142.4 KB Created: 2021-04-22 12:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58921bbe5cf65770d676d93cf28ecffd SHA-1: 91a32023f86f8e7c46a282aa5d45f0f7687aaa66 SHA-256: a9054433e30c41f1a974522c816b05b459419c57651d14ebc6fd625188238105
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an external URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to reference 'D-link taipan ac3200 ultra wi-fi modem router setup', suggesting a lure for users seeking technical support or setup information. The presence of an external URI and the ML classifier's high confidence score indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=d-link+taipan+ac3200+ultra+wi-fi+modem+router+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381318/normal_6068c2059d788.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/cerrar_present_yo_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459776/normal_6004ba6fcfde5.pdfIn PDF document text
    • http://kexedoliresile.22web.org/how_much_weight_loss_metformin_pcos.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/Jgciigf/library_building_design_project.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/KhaOq9o/class_9_social_science_solutions.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/6a98c3da-ddd2-4081-9a2c-bb0d668ecc7e/ancient_greek_timeline_bce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bc54c6-0fff-4e75-bbbe-a17c4718c790/rt_ac66u_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e678e54-4e2a-45d8-a04b-eafa94c674ba/67964790774.pdfIn PDF document text
    • http://wezojepodi.rf.gd/pusifafudopepuli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516126cf-3fff-42a4-822e-46ba9e4df954/73829868068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ce385d-c20f-40cf-be59-533ff50a467b/76130887140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5f7f38-e8d9-41c6-a144-3eb6bd61cb97/how_to_use_the_canon_a1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5cf58a-4df2-4071-bbfe-16943d793ced/vovadov.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 53468 bytes
SHA-256: d264f2104ad28746223701ed59b999cb48e9b5682532979e60df70a1111df2c4
font_01_sfnt_off0001cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC8B 5924 bytes
SHA-256: 4c72d78877030cec433accb5f9444c6013053a48460e79dd1cfa332cf9692098
font_02_sfnt_off0001e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0CC 8924 bytes
SHA-256: 9553a8d98c65c5dd15de2fa95a50afc42bd7834c7313bed958e8d2875674a50e
font_03_sfnt_off0001f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2BF 20436 bytes
SHA-256: 136aa0a575a1312ae3c7de4ca5475ba427f4908e6efea12b26cd2966829d9bf3

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