Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ac313e98312c9b…

MALICIOUS

PDF

72.5 KB Created: 2020-12-22 16:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23e68ed0d500fd06765ab2ba005c867 SHA-1: 19282609d88a3afdc2ad04b05f5a89762af1a0e6 SHA-256: 04ac313e98312c9b4dc2c10f9c4bd82aa8beacdca0857538f42a6ebe55c40775
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links leads to known malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=verb+phrase+exercises+with+answers
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/dowapilonibarulix.pdf
    • https://cdn-cms.f-static.net/uploads/4479454/normal_5fbc830442623.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_5fd11c4cb6334.pdf
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/2492149.pdf
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/e2cba94410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xasovewipeje/wukuxerim.pdf
    • https://s3.amazonaws.com/jopomodilamego/kobasavogakuxetunazaso.pdf
    • https://static1.squarespace.com/static/5fc64ee16b97992eb580530b/t/5fc80b9df87c892ec7d9a804/1606945694471/mesobelu.pdf
    • https://s3.amazonaws.com/luramamelolem/wapibixuzap.pdf
    • https://s3.amazonaws.com/baxegezivumi/12th_half_yearly_answer_key_2018_biology.pdf
    • https://static1.squarespace.com/static/5fc4c14b27a199023ace2433/t/5fc51b29eaf37e3b643f3572/1606753070625/discourse_on_the_arts_and_sciences.pdf
    • https://s3.amazonaws.com/suxiweke/26985084849.pdf
    • https://static1.squarespace.com/static/5fc69626f7cf8c7540521d22/t/5fcbcc7964036b614397309e/1607191673632/eddie_the_fox_25_boston.pdf
    • https://s3.amazonaws.com/tazibabebamep/55873308337.pdf
    • https://s3.amazonaws.com/kibavutibeved/47729527733.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11b.bin
1a918b1d6b4b1263b3dafdc34151ed09eae93d3d9dfb5a5a821f334761268b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC11B 5252 bytes
font_01_sfnt_off0000d301.bin
7cd63ea236a3a6d34ee5cfcf5f2ed40bd3c4c6d914ea15b4ac01f3e62163efdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 2032 bytes
font_02_sfnt_off0000dc91.bin
1b3d656a033e88ea32ee42550b4c974d4a92bfc5f3b3d5e9d9150f9f4e87c817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC91 10160 bytes
font_03_sfnt_off0000ff52.bin
913ecc3ea5dd8bc153026c93938bee31f5bdeeda32ecb78360622157facf6139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16096 bytes

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