Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfec8d2e88ad1df…

MALICIOUS

PDF

73.8 KB Created: 2021-02-25 04:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d411f6aba71670c34e50cc425ddc8e9f SHA-1: e23f670a671ca29680b0873146754df026accdb7 SHA-256: acfec8d2e88ad1df117494a4c1187ea870dc23762b4f3a20216632f8d130abf9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The 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 'jottigo.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://jottigo.ru/award?keyword=echo+backpack+leaf+blower+gas+mixture PDF link annotation
    • https://cdn.sqhk.co/depivuni/cWmWAij/diners_club_ecuador_solicitud_tarjeta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5ffa5efd85ed6.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/hdTjcjd/chargepoint_stock_price_target.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/jdib0hh/xomebusugufimodevusomas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405639/normal_5fe1368ec47bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fee80db9b8e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_5fc8e333e4a55.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/gukorezuver.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fcb5d07bc494.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/meful-zelizabaf-pesumamam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491155/normal_60065ed1650d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483608/normal_5fdbc33c9bc16.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/hhdihwF/xekesigovizuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8QkYIln/man_down_cornwall.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/hgjBijn/visedotigo.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/ifBjgie/putokimo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 5752 bytes
SHA-256: 45cdc32f4f4cf8d078b3b7c3bbf15b04960f34cd6808faa6dd1f12c5a88ad3ed
font_01_sfnt_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10968 bytes
SHA-256: 1c44f0af0c0346bdb5240b0934bba4eeac5d87c75b85c3d989fe1747dfcfd525

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