Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e15705e08a1dc9…

MALICIOUS

PDF

69.8 KB Created: 2021-04-26 18:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e9c055d27fff8d2ccd981cf1dd4c163d SHA-1: 11123e03b8e8b7ed53cd48849b4ab4422d2e6a9f SHA-256: d9e15705e08a1dc91d1228c89533db575675fb8f4b4c2abfdc02988b98e5cebd
156 Risk Score

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 0.9992

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://kuzutuzo.ru/strik?utm_term=engineering+dynamics+a+comprehensive+introduction PDF link annotation
    • http://betizekaxu.getenjoyment.net/91070393122.pdfIn PDF document text
    • http://tedabelefodeb.22web.org/38250293600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fixararololu/expresiones_comunes_en_ingls.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/casio_w-201_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/paxumikixana.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/43269068592.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_94ad57cade274f3d8d25c1fafaf05e91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woberiz/sirivezumu.pdfIn PDF document text
    • http://dewubutojuza.rf.gd/sajutifutirejabom.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/sword_art_online_integral_factor_leveling_guide.pdfIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_a86e531f79c44ee384e84b953b0a2af3.pdf?index=trueIn PDF document text
    • https://366cd995-4ddf-4220-a197-7cea849caf0e.filesusr.com/ugd/947062_cf758816cdb040559c39ff2e9f717325.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_16699a8325d544dbbb7139ac095b4304.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/wikigekaletiperajeke.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/92274749638.pdfIn PDF document text
    • http://feletik.epizy.com/antecedentes_e_historia_de_la_geometria_analitica.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/english_placement_test_practice.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_036e05e0ddad43149d8d9224809e4fdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mubefula/80572212303.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/9071680697.pdfIn PDF document text
    • http://vopuzed.rf.gd/ford_mustang_gt_2021_for_sale.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_4e37f9aa563e4fa68c80c70ba491bb43.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_fd8fc7feb0944c53aa07359177b1b5e3.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 5572 bytes
SHA-256: a3167397bf57367ef5b75f38ce8ec6956dcc9969228bf2925470e122f06b60d2
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10160 bytes
SHA-256: 230d6af13b0af5fa9121130c83e65ffdfbc227c203642a5b1d7d42b60498352b

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