Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dcf18df73268bc…

MALICIOUS

PDF

110.2 KB Created: 2020-12-17 15:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cabd1c1d9b4221c880221b530c7a8744 SHA-1: 05c0b15583bc16796513d38c2e4b1ebd4aa8f358 SHA-256: e8dcf18df73268bc74d85878393c5a5bf6636a1fb9a175df4a017ef55d46af2c
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to "Code.org course 3 lesson 21 answers", likely a lure to trick users into clicking the embedded URL. The primary IOC is the external URI pointing to trafffi.ru, which is likely the distribution point for a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://trafffi.ru/123?utm_term=code.org+course+3+lesson+21+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5fb871feb4b58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a0930427-cc3c-4f9f-b993-51e08d5e6bb7/noruvi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/post_office_nsc_form_how_to_fill.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/borderliner_tv_series.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11abd2bbd74065807b22d/t/5fca896ba08b9342fa9ed34e/1607108976738/jinakugosal.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/anti_inflammatory_diet_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5347c18-e61a-46db-984a-56aa3e48b240/58565378573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb958daf-cf3c-418f-9726-365a442bb9f1/83193323876.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/kirenavaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/teleput.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/dragon_nest_mobile_top_up_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d26d30-0799-4a99-9319-66b7f2cd66b5/ed_and_lorraine_warren_books_list.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://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 4520 bytes
SHA-256: 6e648f0db777d2b9951d90ac0f18feaf99c4173179de7e323cd4bf8442f23ac5
font_01_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 5356 bytes
SHA-256: 4414603a9ae274bff7eef4870ed66af66698686c95ad649ed69a3b1657af4f71
font_02_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_03_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 5032 bytes
SHA-256: 3fa39aeaa4275cb95ab3152a28b11140d959d3074d3f64c3ebb546802d949e67
font_04_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 3840 bytes
SHA-256: 5b8e8035f8940535bfb5f3d78de7d5c45dbc51c905faa5d9788b8fc152e96872
font_05_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_06_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 5820 bytes
SHA-256: 24d195b034b8a40d08034116170117ec4abbfe555f828fc6d97dba284e61bfa1
font_07_sfnt_off0001363e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363E 15184 bytes
SHA-256: a5c3b2e2f5a85889cc3cecfac86bf7f7712fef7db596a9225b456de85f54eb46
font_08_sfnt_off000162f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F6 18196 bytes
SHA-256: 131532f03b36dc241f5adfb7361ef2f36019010d26794e2daa3b4b3f702e089c
font_09_sfnt_off00017fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_10_sfnt_off00018dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DD3 2704 bytes
SHA-256: 025538e3588f7b9d3e560964fe9e5c5dd3c522b204bc36b7a61ab4edc9b69206
font_11_sfnt_off000198f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F6 3992 bytes
SHA-256: 97b84d0ca288952b22998d671afe20f3fa8cf18f3377339cbe20b6b15cef2dbe

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