Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8537d9f56edebe…

MALICIOUS

PDF

142.1 KB Created: 2021-03-27 17:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 044780f71bc79ade2a6519510a5ecfe6 SHA-1: 57703b4074571c298c40864016e8112aeaffa559 SHA-256: ad8537d9f56edebe2212488d88ad6f63b647aec0b5d69b340638b3645fc37700
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nipisod.ru/123?utm_term=5554+android+emulator++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369163/normal_601a7477a6177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_5ff5172dda240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_603dd4ea46bb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_600483261b86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fdc66fc0561a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5ffe91fd10add.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tokudapele/28757366381.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/13743913872.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/setagumuvobijeg.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/34586644320.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/zozojewijoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/comma_practice_worksheet_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/chapter_4_atomic_structure_study_guide_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/simple_feasibility_study_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3512db-d57a-4799-bbe3-a37842dff982/zakivalidomolezumufamelo.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/64521444798.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/verujewem.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/67456133443.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/what_are_financial_models_used_for.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/demuwuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcc9dd8-3c38-4769-9b42-fc7730abc3f8/12_types_of_tenses_with_examples_and_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00825367-4543-487b-962d-eec315735d9f/pegobimotowalakomoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/tupukegamobigusibop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF74 4876 bytes
SHA-256: 76d310965907eddf155a929944ff4d91f59c17175d622ea2f2cea63ac8076356
font_01_sfnt_off0001efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFEC 12424 bytes
SHA-256: 72694a95241bdf09ec673aa7c696289e5cbb89190023379bdab830713780034a
font_02_sfnt_off00021a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A3C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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