Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcbfff65861aea9…

MALICIOUS

PDF

81.8 KB Created: 2021-03-28 12:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 306d42a8cae94327076d7ebfe1c35b8f SHA-1: e3ad6614f9fc4714927891938efa63769358ba3b SHA-256: fbcbfff65861aea986bc214ddb087b7f95f346daee3b0c77c0d156fef94671e6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the presence of numerous URLs like 'https://seumenha.ru/strik?utm_term=is+the+twilight+saga+on+netflix' and 'http://gosepakaf.getenjoyment.net/xabunek.pdf' points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://seumenha.ru/strik?utm_term=is+the+twilight+saga+on+netflix
    • http://gosepakaf.getenjoyment.net/xabunek.pdf
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/b97c5a8745cc.pdf
    • https://tolonatapuxid.weebly.com/uploads/1/3/4/0/134042297/rawot.pdf
    • https://waretopaze.weebly.com/uploads/1/3/4/5/134529701/1641061.pdf
    • http://gadosamu.iblogger.org/filanin.pdf
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/xajaru.pdf
    • http://consumer-data-protection-bureau.com/beretta_m9a1_accessoriesxc82n.pdf
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/gamipogabevejew.pdf
    • https://cdn-cms.f-static.net/uploads/4472506/normal_604a178ca937d.pdf
    • https://netafipagugid.weebly.com/uploads/1/3/0/8/130814009/moraxovataleni.pdf
    • http://jixuboxa.iblogger.org/dowagitekuwefuteva.pdf
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/vadakabesomaxor.pdf
    • http://lesibixubivazo.22web.org/biochips_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ffd6a9701bce.pdf
    • https://cdn-cms.f-static.net/uploads/4463279/normal_6013945d5f607.pdf
    • http://sayseedokg.com/how_to_learn_probabilitycgilc.pdf
    • http://kidiwutimako.mygamesonline.org/berenice_edgar_poe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuvixivo.epizy.com/friedel_crafts_acylation_chemguide.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef06.bin
a50a9d72a0deb5382c311988d21c6500b632c9005d536bbcaa881df406e77892		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 7416 bytes
font_01_sfnt_off0001020f.bin
688ab73ebef283ae61d39af3c7a9cf124326d270d12870b9f95647c946f880ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 5032 bytes
font_02_sfnt_off0001134d.bin
785d0e2b124e70882ce6e09c62bf46da75da34c314f011223eeea26cb93a4550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 11308 bytes

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