Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b4c86083f9ca15…

MALICIOUS

PDF

92.3 KB Created: 2021-04-02 01:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f7b5e521fe28212680680f4d3a130280 SHA-1: 175d138891b65de216279a7bbf16bdb0c13a5829 SHA-256: b0b4c86083f9ca1520909dc3133394b07f036dbfb45a361f4d55c9db2e5c24d4
186 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/aws?utm_term=what+intermolecular+forces+are+present+in+each+of+the+substances+h2o PDF link annotation
    • https://bujapuvewujik.weebly.com/uploads/1/3/4/7/134702992/2910031.pdfIn PDF document text
    • http://keep-travel.com/6796502712mu6u2.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/gifbhfq/winofexibibe.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/19eb3.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/what_is_the_concept_of_power_in_political_scienceq552c.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/azggYjf/jomanokuvitupabirano.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/jjjhQaO/51432484584.pdfIn PDF document text
    • http://bit7.top/bobuzemuridenebozutelidao4k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_6020f955c8d16.pdfIn PDF document text
    • https://buzegiregusa.weebly.com/uploads/1/3/6/0/136082094/3479633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5ff5e7f8f0601.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5feeb59290dc0.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/timeziso/cuda_toolkit_9._0_guide.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_84caa47155194cada8ddc82a0e9572a0.pdf?index=trueIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_22c34f2436f24faa86ba7d0b62a8d157.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/sni_bioplastik.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_e68f57a57af740f598b4e98600235841.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 5540 bytes
SHA-256: bddc0fa47fbd57c30fef4ea571360498854acf9f7da2ae83f4452f18715c4a3b
font_01_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 11488 bytes
SHA-256: 9f4f53baeccff11f1658969c9125156ceffec5a203b49688f6e2e882073d2c97
font_02_sfnt_off00014ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE6 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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