Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c597eb464ef527…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 15:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba68de41151a00a9340136f143aa7b37 SHA-1: 74ec8cb872943cd3f15761894cbd0a06c62ddf54 SHA-256: 90c597eb464ef527476d7cdee6f9ceccc5c2585e12fc3275964c28759f89fa37
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://jacksth.ru/123?utm_term=normas+apa+pdf+referencias+bibliograficas', which is likely used for phishing or to download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests a malicious purpose.

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://jacksth.ru/123?utm_term=normas+apa+pdf+referencias+bibliograficas
    • http://kiparegazeratax.getenjoyment.net/apc_power_saving_back_ups_pro_1500.pdf
    • https://cdn.sqhk.co/xibetevoxaj/L1icNgd/11775463183.pdf
    • http://jakesubinosol.scienceontheweb.net/82902247475.pdf
    • https://cdn.sqhk.co/lowanivari/ij2iihi/56988945815.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6018aeeca2c75.pdf
    • https://cdn-cms.f-static.net/uploads/4466172/normal_603e2aa989ed3.pdf
    • http://ziwegiwe.iblogger.org/eight_of_wands_reversed_tarot_guide.pdf
    • http://pinegobojefo.getenjoyment.net/49801819943.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7059bfc0-d858-490b-adb7-5f200a9eb650/what_is_a_general_release_of_claims.pdf
    • https://uploads.strikinglycdn.com/files/0712de1d-bce4-4455-ab23-203ae8ffcdbf/pakakimazu.pdf
    • https://s3.amazonaws.com/tigovatolis/letra_y_acordes_de_canciones_romanticas.pdf
    • https://uploads.strikinglycdn.com/files/411bb574-c50e-4cad-b49d-0155a7a81429/zajik.pdf
    • http://vogijub.rf.gd/gakazugesez.pdf
    • https://s3.amazonaws.com/gidibesuxi/brother_mfc8710dw_drum.pdf
    • https://uploads.strikinglycdn.com/files/554c38ac-e6a8-42c8-aa10-c74db2dd8d1c/13836265381.pdf
    • https://uploads.strikinglycdn.com/files/acba8cdf-3778-4b3a-b15b-f8007f3ac8c6/68406746281.pdf
    • http://didopip.epizy.com/fuziwavubadexoxirigad.pdf
    • http://dupivet.epizy.com/does_anti_inflammatory_diet_really_work.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0be.bin
249f47eb14080a48c38df40a8b734fbd649368b5008ad51060dc381de6fca325
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 5584 bytes
font_01_sfnt_off000103a2.bin
1765e37a543fe8c905278ee62c87a6dbb633297022403d027ccd781cffb1d958
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 12400 bytes