Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8750e90cb523c7c…

MALICIOUS

PDF

72.3 KB Created: 2021-03-04 21:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c66ff9e5c75c68156ee6289b9de6f599 SHA-1: c03a6229dda45400db0ad6ce324c5a22a8bc1f8b SHA-256: c8750e90cb523c7ca85e9a5ef585039f57d8579dab9db28575c5523a80eff61e
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. It contains an embedded URL pointing to 'midufefew.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to physics educational content.

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://midufefew.ru/wix?keyword=physics+classroom+free+body+diagrams+interactive+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fe92fe198304.pdfIn PDF document text
    • http://chisto-chisto52.ru/captive_prince_damen_fancast5tl9f.pdfIn PDF document text
    • http://detonic-romania.website/iceberg_theory_of_culture_definitionk1u57.pdfIn PDF document text
    • http://opencabinets.xyz/piwofafowepaiehhd.pdfIn PDF document text
    • http://senteber.site/warframe_how_to_sell_prime_partshjixb.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/19981053638.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/41804877058.pdfIn PDF document text
    • http://jenirafona.22web.org/31272492421.pdfIn PDF document text
    • http://politach.com/pugonigbw9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_603b22337b2e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemesuxaw.myartsonline.com/draw_lines_of_symmetry_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/revumerasawapef.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/73949192914.pdfIn PDF document text
    • http://fetufebutegiv.rf.gd/vafusobafisiwunifulavuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/xivogofixipidalatonefumo.pdfIn PDF document text
    • http://kokokifutalikop.epizy.com/alcoholics_anonymous_application_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/c_o_c_mod_apk_hack_version.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/anaconda_1997_full_movie_in_tamil.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 5832 bytes
SHA-256: 1c9f5ea951685c8f016f610b33336567ff7b8b1c14b1b80c11041c75c38a5187
font_01_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 14000 bytes
SHA-256: 8dfca2dc6891f61287ad8fe0723363d2ce8ba9fb59094a0fced7cf78fda210ba

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