Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca341bc292e08ed…

MALICIOUS

PDF

75.5 KB Created: 2021-03-29 00:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0517c3b91022203b23605108d831c788 SHA-1: 5984506fab7edb28f06e08f310da1730cf1068df SHA-256: 1ca341bc292e08edb61f1057d8ac21d221c846f3b4d623d17a196b2266e986aa
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 URI pointing to 'mezovuduw.ru', which is likely a phishing or malware distribution 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 0.9995

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://mezovuduw.ru/wix?keyword=marvella+pearl+bracelet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407304/normal_603446ec79f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_60339bce4a209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6044245a50b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_6017869123812.pdfIn PDF document text
    • http://xudisoda.66ghz.com/are_starcraft_aluminum_boats_any_good.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_6049a8aa773a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_600a9330d061d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5ff429a371208.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5ffaca0442b98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d42b29d-c275-4244-895d-fa71eba543be/sample_5_paragraph_essay_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7da6568-1149-42f9-bf4b-c1864d456843/wafatesuxaxobabuvinu.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/organizational_buying_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e9466b-eae4-4880-8cdd-29d97690a12a/44083824787.pdfIn PDF document text
    • http://pomezup.epizy.com/important_english_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/kukegifaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b305dbab-8cda-43ba-a8f9-645c9a1d44dc/john_deere_48_mower_deck_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/57054131725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6888f2a-9701-4e6c-8a09-638f7847e1df/nuvuporazuxosuxidejirerav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783095c4-74f5-4242-bdd5-942cdde40fc2/wowulanuvejamufaboge.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/c._d._b_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea5a471-70a0-4cf1-ad37-ff76dcd6b954/what_is_the_function_of_the_kidneys_in_the_excretory_system.pdfIn PDF document text
    • http://metopojur.epizy.com/97291832590.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 4952 bytes
SHA-256: 9b4db8d2f2b2d7809bd07b895d0c576db98480dc45db90c2330a5e2a50515093
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 12312 bytes
SHA-256: d0ab7ba2bd6f22d254a043d8208ac012b657a2d41b468d1fbfc98e8ae8636aac

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