Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0ef41872bbe9b3…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 02:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32653af3135cbd7e34e7d17b2f305b4 SHA-1: eb5757ed2fef84a9fde2ab3f2a128ddadcdf6353 SHA-256: ec0ef41872bbe9b3d812f4bc44d2c444966e2c3f284deb09915022572beeb0be
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to a domain associated with phishing or malware distribution. ClamAV also detected the file as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. The primary attack vector appears to be spearphishing attachment, leading users to a link farm.

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://xezojetit.ru/award?keyword=alphabetical+filing+system+pdf
    • https://cdn-cms.f-static.net/uploads/4381759/normal_6013b509c527f.pdf
    • https://static.s123-cdn-static.com/uploads/4486213/normal_5fe3ff902084e.pdf
    • https://dodesurazuxosa.weebly.com/uploads/1/3/4/3/134382101/3805043.pdf
    • https://cdn-cms.f-static.net/uploads/4480584/normal_60478255c4b0c.pdf
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/8249917.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_91c0dfb59e5d45c488cd42ff2ec25edd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5fe1478-0534-4a09-9df9-e0e4c6d69a0c/kitchenaid_coffee_burr_grinder_settings.pdf
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_f6f21f164edc4f919fb1460571fe5484.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5106892d-13c3-493c-9788-98f62ee73017/bojunale.pdf
    • https://s3.amazonaws.com/sewamos/drill_guide_for_pipe.pdf
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_eb9768fafe5a40d18bf4f69b1fa5f1f5.pdf?index=true
    • https://s3.amazonaws.com/donarepemi/canon_eos_utility_full_version.pdf
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_0b03bb4cd45b41d2a32d5b1436be84c3.pdf?index=true
    • https://s3.amazonaws.com/nijudow/windows_10_activator_txt_file_free.pdf
    • https://5121d360-3808-4f61-aa44-d87cf2d9d428.filesusr.com/ugd/032e8a_6f21c0b9d8534b45b56540bca28b429f.pdf?index=true
    • https://s3.amazonaws.com/zuwosil/migalanen.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_off0000ff16.bin
1c15dc730b08e54463699f78e8bc080d6b2f13ef273774c646b7f8fceaddfae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5704 bytes
font_01_sfnt_off00011268.bin
4d56277746984c390417fc1f208e53b07dc1d429c086f4cde621cd31b98e6795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 10340 bytes

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