Malicious PDF — malware analysis report

Static analysis result for SHA-256 3129288d60a2dbe7…

MALICIOUS

PDF

95.9 KB Created: 2021-04-04 14:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec976db5cffb8715b2da0124560d8071 SHA-1: 7be8b18f822bdc563ce8162452dafd9682a9f125 SHA-256: 3129288d60a2dbe701a2c260b7729bf2e8d90caae9c70a72c8b3242e64d97da1
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely part of the phishing lure. The document body, though partially garbled, suggests a deceptive title to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=abstraktion+und+einf%25C3%25BChlung+pdf
    • https://static.s123-cdn-static.com/uploads/4489732/normal_5fc85cfb81f81.pdf
    • https://cdn.sqhk.co/xovinexesun/iazUhhd/angular_acceleration_formula_newton_s_second_law.pdf
    • https://cdn.sqhk.co/nuxegaxujifo/njdhej8/36148789833.pdf
    • https://cdn.sqhk.co/duvetezoje/qcMhcii/53912545441.pdf
    • http://lasomupigo.iblogger.org/accounting_words_english_to_gujarati.pdf
    • https://cdn.sqhk.co/visobipibe/AhaYjfh/running_fred_1._9_2_mod_apk.pdf
    • https://cdn.sqhk.co/zibepidok/rWDAiaD/27564669046.pdf
    • http://avtoshtorki.shop/girufirembd3a8.pdf
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5ff9f606dfedf.pdf
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fd2eabf7f31c.pdf
    • https://cdn-cms.f-static.net/uploads/4464315/normal_601e74861423d.pdf
    • https://cdn.sqhk.co/pememobuwir/jjJggYG/medicine_career_path_uk.pdf
    • http://luminar4-download.xyz/861969856337pao5.pdf
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fc996dba1230.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vefagotoje/lodajitux.pdf
    • https://s3.amazonaws.com/pivetuzadujo/wutajesako.pdf
    • http://bebamefuveb.rf.gd/zogawi.pdf
    • http://sazibiwakefot.epizy.com/5227301075.pdf
    • http://vujoponax.epizy.com/51572939426.pdf
    • http://tinasixubu.epizy.com/banana_bunchy_top_disease.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ee.bin
aa368566bbbb66d4b77153b0cfa55aa8ada3d31ad4b7c5dd4a9c7e1562fc7da3
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 13268 bytes
font_01_sfnt_off000133bf.bin
cd1bf04a5b5d2c5f28d3db7a085e94e9fe6aa189242da2fc84828f87385b37fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 5616 bytes
font_02_sfnt_off000146a4.bin
0d5653bffd096ea4764dc739d3dcd36c16db0000d97e22a6db15b521307bb99c
pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 12680 bytes