Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e39ec16738ce44…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 21:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e06603fa4ef1f79d852f21271301b087 SHA-1: 21dbbb672f40bc9ee61094d8b59ce640644574a7 SHA-256: 54e39ec16738ce4420557262e858a1eb14056071acb03a3feb764a3f733b0fcb
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://soxebez.ru/123?utm_term=beginning+node.+js+basarat+ali+syed+pdf PDF link annotation
    • http://wotidoteked.mywebcommunity.org/bellman_ford_algorithm_example.pdfIn PDF document text
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/pivesutejuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_602b0e6a56248.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/43844703560.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/mujage-jaresigubad-kebasijiliriko-kuzajusu.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/zulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_6018a98bafc6c.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/rijinuloxososoziboga.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/kosatar_lanupojenuju_metumip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_2ad4a11e20a6472a95d069c096a44d76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/badin_lake_fishing_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/parquet_format_schema_evolution.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/89262517563.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/dolefaresafoluk.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_6d970466515643e78a89696d88fa6f2b.pdf?index=trueIn PDF document text
    • http://puribisipup.atwebpages.com/cementation_of_all_ceramic_crowns.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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 5608 bytes
SHA-256: 91b82de922c113dc3e2e980b30bf34ab10cb46d03b168762fb72478525852455
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 3152 bytes
SHA-256: d0d2cbb3c0be40a526c81c3f9c37f258e751b91624a59e3a93395cfb1e89724d
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10740 bytes
SHA-256: 2e929de98ac173059a9a493d6ec23e82e5ecbdd51fbbee97da4b7403557029e7

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