Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b59de1c2c2bf68f…

MALICIOUS

PDF

75.9 KB Created: 2020-12-06 09:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 460006f666de40685e2f21c0385eae06 SHA-1: 98d87d0f1a4253cba95587667bd87f71cbe0679a SHA-256: 3b59de1c2c2bf68f57833927e059e967a00119f637e41f5d49586100fe1dfe08
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to the wkhtmltopdf tool and a date, suggesting it might be a lure document. No scripts were extracted, but the presence of a malicious URL and the high confidence detection scores indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=atlanta+parent+magazine+summer+camps
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b012d51a-2bae-4803-8373-667befa7a275/99246277926.pdf
    • https://uploads.strikinglycdn.com/files/bf60f4ad-f7d6-4421-9ca4-ddcdeb385a76/darobisisepovonolapas.pdf
    • https://static1.squarespace.com/static/5fc65c44d49dd1244759b117/t/5fc93e144480646fe475e2b8/1607024149812/smart_launcher_5_pro_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/7297d7c5-043d-4726-a23f-958560610e3a/vafivubugamaxesudube.pdf
    • https://uploads.strikinglycdn.com/files/dbd21cc7-6e59-4faf-b786-2108027b49fd/why_is_iago_jealous_of_othello.pdf
    • https://uploads.strikinglycdn.com/files/ab2f77c4-fb7f-4fd5-bf13-d9c58da49523/37057442036.pdf
    • https://static1.squarespace.com/static/5fc57c5b9698b02c7f3fb057/t/5fc762a4a038a451bcecd0b9/1606902437433/wokadad.pdf
    • https://uploads.strikinglycdn.com/files/ea058b5a-3c39-4c0e-b314-eb9ab4a91212/andrea_vilas_boas.pdf
    • https://uploads.strikinglycdn.com/files/efc8b924-7893-481b-bbb6-cf8eec737265/mac_os_x_10.5.8.pdf
    • https://uploads.strikinglycdn.com/files/8f4045e4-d6c4-4a4a-ab0a-4bc399fd3e9c/56993261792.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfe2568bfc51861682467/1606221349738/voice_over_classes_los_angeles.pdf
    • https://s3.amazonaws.com/leguvefu/40333519982.pdf
    • https://s3.amazonaws.com/kavitokolezub/veserivelu.pdf
    • https://static1.squarespace.com/static/5fc58a1012facd59cecc81e0/t/5fc9bbdecf87d0256feb9b2f/1607056351011/tigumosabarabojabelafe.pdf
    • https://uploads.strikinglycdn.com/files/8aec6817-88e1-479b-8be5-e3af61063242/99556725263.pdf
    • https://uploads.strikinglycdn.com/files/4265cf40-5e7f-44a3-9574-d11f60902d5c/density_times_height_times_gravity.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_off0000e84a.bin
9448c7468f0559b5506cfaab6e98626bc97772d65212eca2a58f40b69c52af67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 5292 bytes
font_01_sfnt_off0000fa3f.bin
1bd47fe33729e3fd2b823474b914b4bd8b9ce35fa9c9532af66475302ad5f0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 11464 bytes

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