Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a79e398af62a90…

MALICIOUS

PDF

74.9 KB Created: 2021-03-09 06:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 978fba7821319bb66d4bf84c49b5e918 SHA-1: ef520fc6e85b5eb96c83162c903f70c80558321f SHA-256: 25a79e398af62a90abd92d3a0b2b689965934c2cd7a1f5aa23fd887d56192829
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be malformed, likely to hide its malicious intent. No scripts were extracted, but the presence of an external URI suggests a phishing or credential harvesting attempt.

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://zajinet.ru/award?keyword=analytical+photogrammetry+lecture+notes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5fc9f8d8dd769.pdfIn PDF document text
    • https://jifalutisapore.weebly.com/uploads/1/3/4/7/134772579/6343241.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/vonamodovatixekaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403130/normal_5fdf1897eaf39.pdfIn PDF document text
    • https://temeromaxuzi.weebly.com/uploads/1/3/4/7/134745627/9565792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5fe6bef9a8158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_6046285e97704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455374/normal_600c0ae995a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_6011206af1ab6.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/c0748dfe-02db-4014-8962-de2bf12bbe76/29424958765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d569f9-f956-447d-9af6-5e7e31d7b587/19870073476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c689da3-9e15-4fa1-b0f4-4ec5ea7e97ee/how_to_hook_up_steering_wheel_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717fc599-f5da-4cbb-9006-b3a2c1c6ffb9/rival_electric_food_slicer_1030v_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82106598-f09e-4ff5-8d43-f2ac0d53735e/gawuxufijevabex.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/bsrm_spasticity_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/10199068692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8569c7fc-6b1e-4df4-a068-50f5bb5885eb/jusezesagezaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7a5f4f-e333-41b9-b2f0-0cffb01461c2/99684313428.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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 1604 bytes
SHA-256: 7f8d84f279369098eff929b81254410c3caa7ba096a52b3ad4234465cd67bf56
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5660 bytes
SHA-256: cde29fbd1dc64e55ae3afc81396b3863fd3e1d409d505a817d80011fb4513a38
font_02_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 10240 bytes
SHA-256: 7158a7cdf79aad32a44c35ec3aea1aa54be01a1cd6c4806968cd721a7be84af5

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