Malicious PDF — malware analysis report

Static analysis result for SHA-256 394e8c506abe0ab0…

MALICIOUS

PDF

51.7 KB Created: 2020-04-04 14:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b87ce9f161281ba357eb1ad57f6f30ed SHA-1: f6a7454cda1df5e5c0756b2bc1c314c95ae35d1c SHA-256: 394e8c506abe0ab09f5772610fb06f9d2c820e562212ce4f50afa50f3f3b8dde
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to thermal expansion exercises, likely a lure to disguise the malicious intent of linking to numerous external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 4

  • 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 http://morningpeople.club/uploads/1/3/0/4/130489025/130489025.html#ejercicios+de+dilatacion+termica+resueltos PDF link annotation
    • http://ihrlandschaftsg�rtner.de/uploads/1/3/0/2/130288522/2612526.pdfIn PDF document text
    • http://blacksmithspdf.com/uploads/1/3/0/4/130489082/fuxuzimebinew.pdfIn PDF document text
    • http://nklovefashion.com/uploads/1/3/1/3/131398541/texozoxor.pdfIn PDF document text
    • http://tributecr.com/uploads/1/3/1/4/131454549/jobawiz_voxidekin_xiperux.pdfIn PDF document text
    • http://keepsakemags.com/uploads/1/3/0/2/130289291/sazeki.pdfIn PDF document text
    • http://blackriverconnections.com/uploads/1/3/0/2/130288909/ruwimamibajago-ninavetajudod-zotamanupasipat.pdfIn PDF document text
    • http://traxessjapan.com/uploads/1/3/0/7/130739875/32c251.pdfIn PDF document text
    • http://xn--ihrlandschaftsgrtner-pzb.de/uploads/1/3/0/2/130288522/2612526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B48 9864 bytes
SHA-256: ce2306e69421d580f371ea9a70adf63a37ff6baddd4e670a2081745b5439e2ce
font_01_sfnt_off00008ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA7 2860 bytes
SHA-256: 4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912
font_02_sfnt_off000098ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AD 4440 bytes
SHA-256: 1c6286544fe08f7cd0ad10a00beecb1698c33a1c59add36ef261dc1fd5a0f191
font_03_sfnt_off0000a8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A8 16620 bytes
SHA-256: 1c2f68d88fb1b5821d522b08d0630a6406cf5f6436f4059022fa073fc924577a

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