Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d024111c4cd736…

MALICIOUS

PDF

70.1 KB Created: 2021-02-18 02:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c437eec47f2d6882ebf2441ce4dd2662 SHA-1: eafee635101f8632c3fe7cfcbf348b64a2896b06 SHA-256: d8d024111c4cd7361984bc3ee62346c0ecb334f9c69749967fee00338c6c3769
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 0.9998

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://jottigo.ru/wix?keyword=summer+drawing+pictures PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374853/normal_601a63312934f.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/dexiwigoretepi.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/5717793.pdfIn PDF document text
    • http://get3creditscores.info/tagejasatetafesojazue5r1b.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/gi3xxZJ/wofatubunojef.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/8932910.pdfIn PDF document text
    • http://milafikolume.iblogger.org/kedeviwixatej.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/IWfjjRd/64501060785.pdfIn PDF document text
    • https://cdn.sqhk.co/jogibigeda/givxghj/64224995178.pdfIn PDF document text
    • http://santaparker.store/tumilulijspqq4.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/jb2jjSQ/3411042700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_602adf9db128c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xupewosupegosax.epizy.com/web_page_template_psd_files.pdfIn PDF document text
    • http://katudajug.epizy.com/96422809576.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/wezibifabimo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB7 5328 bytes
SHA-256: 1319d07d7d3574789b61bc20a891b19e02e4445f167a0b86d7fdbb78f962a252
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 9564 bytes
SHA-256: d9e034338e2a97579cc5b993ff0661b1679a3eca6c69b53d4296fc9ff85687e5
font_02_sfnt_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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