Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b77a36ba9a1a780…

MALICIOUS

PDF

158.4 KB Created: 2021-02-15 18:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3323f090b1781cf21102f689ab64ed4d SHA-1: d7915717c2e8fd8e62a2c4fe5b75090c0c2c20f3 SHA-256: 6b77a36ba9a1a7800d176b85544fbc772a17c4a5590974143295a1aacb95d7e9
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=urban+fiction+authors', likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=urban+fiction+authors
    • https://cdn-cms.f-static.net/uploads/4443809/normal_60160e0ed41dd.pdf
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/1707945.pdf
    • https://dosisusibifoba.weebly.com/uploads/1/3/4/2/134236234/529cfd1b873c89e.pdf
    • https://cdn-cms.f-static.net/uploads/4471682/normal_5fe69055f323e.pdf
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fd1a0e99dfa3.pdf
    • https://vafunaparixidi.weebly.com/uploads/1/3/4/6/134627598/be97ae43ace5.pdf
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/putew.pdf
    • http://milafikolume.iblogger.org/12045095043.pdf
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/367436.pdf
    • https://cdn-cms.f-static.net/uploads/4455670/normal_5fd1e80feedb8.pdf
    • https://cdn-cms.f-static.net/uploads/4451353/normal_602272fe06d4e.pdf
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5ff565fe9121d.pdf
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/9518785.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/wuforisukabos-ditokodofupese.pdf
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/bavofujimomisol-tugagu.pdf
    • https://static.s123-cdn-static.com/uploads/4383695/normal_5ff9bf2b9a8cd.pdf
    • https://cdn-cms.f-static.net/uploads/4408598/normal_60297a538b653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pumonufagatoteb.epizy.com/bounce_fabric_sheets_and_mice.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_off00023253.bin
2397abe8a3a0b89eeff721eaf453e4ebf90d53ff9e1059eb7c385dc4b5d2f377
pdf-font-stream PDF embedded font (sfnt) at offset 0x23253 5068 bytes
font_01_sfnt_off00024390.bin
db72144c5790109b39bbd6ca6053512d6f61e9a285813447f7861d196e053c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x24390 12272 bytes