Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb697d24b9088fc5…

MALICIOUS

PDF

65.8 KB Created: 2021-03-15 13:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0477f1e79abb84f48bd56aa699d520d SHA-1: d13796b3d4956ca9772134e572957c47770a79e4 SHA-256: eb697d24b9088fc569e8e2c63e219a81873a98a4c7a949cb882bb078fe6a60d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, includes references to 'Biohazard 4 game for android mob. org', indicating a lure to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/123?utm_term=biohazard+4+game++for+android+mob.+org
    • https://fatisejodape.weebly.com/uploads/1/3/4/3/134320205/6902414.pdf
    • http://kujinatazema.sportsontheweb.net/nozonikizanagoxisa.pdf
    • https://cdn-cms.f-static.net/uploads/4367905/normal_6019086cc07af.pdf
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/mikomojukarurit.pdf
    • https://kuzirorox.weebly.com/uploads/1/3/0/7/130775715/jumubapovijope.pdf
    • https://static.s123-cdn-static.com/uploads/4381297/normal_5fccfd29685bc.pdf
    • https://sufogewanogona.weebly.com/uploads/1/3/1/0/131070160/5998501.pdf
    • https://static.s123-cdn-static.com/uploads/4405440/normal_5fc9e0a7d5e39.pdf
    • http://napowojeba.medianewsonline.com/ludipenazibotaxikiwavot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_5502b84125f84f679c1d2f690e4a2809.pdf?index=true
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_05389eb5edd24293b27ddc85e92ebf6c.pdf?index=true
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_a82b0102173046178a090bb4a7240f42.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_bb444354cb85436cab74054d26e70052.pdf?index=true
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_758550bdc90b4091bbc0481661c98d2f.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_d7331bad86ea45f0a82896099cd08bc0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/66a492ee-940b-4e9a-97f0-8b854501f098/what_is_a_scalp_cleanse.pdf
    • https://uploads.strikinglycdn.com/files/69f4815f-c591-4271-9a1f-b67352f6c82d/mizuridigonelojasakugewo.pdf
    • https://uploads.strikinglycdn.com/files/79e1c49a-c106-4602-96ec-1637e8d99872/74374049606.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c481.bin
e183338ad13f6e35058ed1cb9bc758dd8bcdaa62cf1ed5d15eb8f909ad569723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 5468 bytes
font_01_sfnt_off0000d70c.bin
93d2d7c04e676492d6d107fa3d37bdb4921aa02e6e5fbec52c61ef5aa74edd92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 10044 bytes

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