Malicious PDF — malware analysis report

Static analysis result for SHA-256 61521e1aa144b41a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 03:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6509bd0062b2197334931d9901e2aeb3 SHA-1: 223ba8fdbd9bab92db06794909edfaaefc07df12 SHA-256: 61521e1aa144b41a6e9c5cb3a1925f04500f16322ee26d8bba7799a06084fbf4
156 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 a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wix?keyword=do+does+worksheet+for+class+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496170/normal_6047e85d650f0.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/8941061.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/301d08610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_601dbc923e35e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_6010acbac5e0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxulija/badmaash_company_320kbps_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/pretty_little_liars_series_1_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/gebok.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/hirdaramani_group_annual_report_2017.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_1bbfe4df88ce46b1919ca7b0cadca474.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_63cec1eb22bb4cc8a1d11bd4fb759b21.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_0fd1aefee8154d4688bbb4c77802bf0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/gitlab_documentation_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/fortinet_fg-_50e_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/78710461565.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/how_to_use_gimp_2.10_to_edit_photos.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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5396 bytes
SHA-256: 6b090408f8ea4ebfac7da865dc575680566a09e20fdf8660a62173119a4bf8d9
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10308 bytes
SHA-256: dfe477cb183d82b72bd0ec2f56d24c7cffdcdb2c9d4430f8542db59226bc8ab4

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