Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a0b4c66f19d07f…

MALICIOUS

PDF

110.2 KB Created: 2021-05-07 21:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 767cd70b119390c6c694803f77ece07f SHA-1: 255f9fc60cce9070df8a9d20f7297d7fdf864cb0 SHA-256: 59a0b4c66f19d07f1c5332ec67e261e5808c440d89e7720a1ef7a030e466123f
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, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a malicious intent to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file, likely used as a phishing or spam distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=what+types+of+plants+are+edible
    • http://nafanesowijim.iblogger.org/zinodujipugelenagipov.pdf
    • http://reweder.site/18799407985o2st2.pdf
    • http://tulavesew.getenjoyment.net/lobagu.pdf
    • http://arenda-comp.space/transformar_6_pulgadas_a_mmjptvv.pdf
    • https://cdn-cms.f-static.net/uploads/4375355/normal_60224dc674f16.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_6046c5fd9740b.pdf
    • https://cdn-cms.f-static.net/uploads/4467300/normal_606c44164ca77.pdf
    • https://cdn-cms.f-static.net/uploads/4426066/normal_602f7ef310951.pdf
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5fe3c77712c6c.pdf
    • http://bisibometixo.mywebcommunity.org/lofogavivu.pdf
    • http://50off.pro/29497191262dphr8.pdf
    • http://dimax-matrasy.ru/a_thousand_splendid_suns_symbols_and_motifszsx36.pdf
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff3c368be12d.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_606b3b7cd9477.pdf
    • http://ridemajabavuv.iblogger.org/xozotuvuzarabadisupevabo.pdf
    • http://vobadixu.22web.org/wedding_budget_template.pdf
    • http://tomandbxof.site/hernia_hiatal_tratamentoshg26.pdf
    • https://cdn-cms.f-static.net/uploads/4443342/normal_60421e821445b.pdf
    • http://dalifajebuxog.scienceontheweb.net/marriage_biodata_format_for_girl.pdf
    • http://zikesopaza.iblogger.org/rulenesot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_1a616aee34b94d64916b81032b7b7eef.pdf?index=true
    • http://dowuxufab.epizy.com/34513132952.pdf
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_0fb489c9f4f648b89af6297ed734ee2d.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012187.bin
62deedb54aaef669db635f4ef87d4bda5d475a8bf20633d6b56d9e4ab12fd410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 6416 bytes
font_01_sfnt_off0001315c.bin
ed30a74c56861624397b5d55f846612a70e267120df8b587dfd444edc4578002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 5384 bytes
font_02_sfnt_off000143ac.bin
54e60bf814a676ca5be8521c7035e6ddcf700773487fa721bfdee5a4c0bd4005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143AC 9360 bytes
font_03_sfnt_off000161a7.bin
99e36576cf2c42ba920b27683de158c49136bd28e40ceabe038ea4e5d15bcf9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161A7 12280 bytes
font_04_sfnt_off00018b12.bin
ade860a384e0436df56bb84eeed4a9486ec680d7c8981cdb0c3745c5e2239263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B12 16256 bytes
font_05_sfnt_off0001a06d.bin
74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A06D 1736 bytes

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