Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7e25f5c9f5714c…

MALICIOUS

PDF

89.1 KB Created: 2021-02-15 03:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f375f65dfa23b60baad68abe1ebfd5e SHA-1: 82ad1797699a4bf52c5ab28cd52932a07483612c SHA-256: ec7e25f5c9f5714c485cfc201a4578515c5257d3adb85467d3911109743cdade
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'jottigo.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The document body, though heavily obfuscated, contains references to 'greta netflix' and 'wkhtmltopdf', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=according+to+greta+netflix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471275/normal_600001fe24441.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/22246682303.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/xulatugun-fegapapujega.pdfIn PDF document text
    • http://golulim.iblogger.org/fegavaropewanipedujali.pdfIn PDF document text
    • http://zorugukuremired.22web.org/48439294029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5ff1305720023.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/08059f399623e.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/84432500072.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/sonexafisosunabok.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/community_helpers_worksheets_free_printables.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/88316931334.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/android_10_features_in_nokia_8._1.pdfIn PDF document text
    • http://zezajezo.epizy.com/lesson_12_homework_3._1_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/gujarati_alphabet_with_pictures.pdfIn PDF document text
    • http://beruraxawiloga.rf.gd/nuramevodosowifaf.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000105b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105B7 15756 bytes
SHA-256: 5465a3ada1d605c82612e4d874193f61dfc4da1bbca921d3ea4a6b3471b3c820
font_00_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 5068 bytes
SHA-256: 7d86b20ecfe44f25fbc8cff90ba911899d9cf235f1e646640f9ac9703c58b2cb
font_02_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 11316 bytes
SHA-256: eade60a5126e5d8895f1bdf860adf664f4340bf349170cc049e30312f93ddce6

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