Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5b3b28aae3c2ef…

MALICIOUS

PDF

78.3 KB Created: 2021-05-23 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 861c3753ba4f861617ac57ea05c5fe78 SHA-1: 53b0dc03a811abb42dbf6b7da26e5652dbf51ea1 SHA-256: cb5b3b28aae3c2ef1881bed23f2eb65a5276e4d4ab3f5898060c9e5a387bfe8b
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://ponafet.ru/strik?utm_term=9.s%25C4%25B1n%25C4%25B1f+ingilizce+1.%25C3%25BCnite+konu+anlat%25C4%25B1m%25C4%25B1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404123/normal_603e855f8e119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_6062658287a2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476564/normal_5ff1c1bf6eec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5fdc0ea1d6da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_6038bc047c6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_602b745fbd74e.pdfIn PDF document text
    • https://wivikomale.weebly.com/uploads/1/3/2/7/132740486/3034888.pdfIn PDF document text
    • https://gijesetezoludad.weebly.com/uploads/1/3/5/3/135348421/6269919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5ff208e5ee3d5.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/vukumesoj/old_fashioned_crisp_percale_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/abcd_telugu_movie_video_songs_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/63212012267.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/esmo_guidelines_gastric_cancer_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/cfa_institute_research_challenge_winning_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/17472289284.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/dagowaginuz.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
    • 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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 5516 bytes
SHA-256: 5053c30f6a75829d0137022835d607e5de14711639d2698066e2f6cb57136c44
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 12192 bytes
SHA-256: 702b5f1f9e2d08d6325ad856f8dbb1e4e2037825a69f9555bc48b5c59b6e9f53
font_02_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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