Malicious PDF — malware analysis report

Static analysis result for SHA-256 184e37a1d6eb1e93…

MALICIOUS

PDF

79.9 KB Created: 2021-04-28 00:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8adab912d07522fc88fc76f5de588271 SHA-1: e2b77d99245b436e64bb5181cad7a6fa1e277463 SHA-256: 184e37a1d6eb1e9335eba7bc1c1da6bfed9a3f4db886b4c56a481c26566d5de1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to malicious 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-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://xezojetit.ru/strik?utm_term=how+to+create+a+butterfly+garden+in+florida
    • https://gijamaxo.weebly.com/uploads/1/3/0/7/130740113/bcfc0c.pdf
    • https://cdn-cms.f-static.net/uploads/4383805/normal_601df994e7347.pdf
    • http://creditpm.com/vubozozurikapib4kxz.pdf
    • https://cdn-cms.f-static.net/uploads/4481275/normal_604027ea951b8.pdf
    • http://discout.online/63345136433ie1px.pdf
    • https://cdn-cms.f-static.net/uploads/4476445/normal_600f835650c99.pdf
    • http://genoray.pro/ponugumanuzjl4gt.pdf
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/nifexeveviwa-difupevo-xejuvorevasufa-tivoxivobo.pdf
    • https://cdn-cms.f-static.net/uploads/4377678/normal_6052a42449b4e.pdf
    • http://geleostone.online/applied_numerical_methods_with_matlab_for_engineers_and_scientists_third_edition_solution1e4r1.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_603233d6c0a56.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fe613b82bfe6.pdf
    • http://it50discount.pro/printable_taboo_cards3vsdn.pdf
    • http://totalcreditreport.info/acid_and_base_ph_phet_lab_answerstgx29.pdf
    • http://flylovel.com/sample_of_construction_safety_and_health_program_in_the_philippinesjocfr.pdf
    • http://todayit.pro/womebemujabejatamunoz7kayb.pdf
    • https://cdn-cms.f-static.net/uploads/4392871/normal_600cf7a7a2205.pdf
    • http://bluetea.space/arms_reach_co_sleeper_brown8ktks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3c.bin
ee59c48a21ae5463c30b04eb090e48691cc10d92908080ab65200df805c9c768		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 5188 bytes
font_01_sfnt_off0000fefe.bin
e17cff8b32b0afc24dcaab86c42ccfb4787b749fed82c10e825217ed2ff961d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 11040 bytes
font_02_sfnt_off00012477.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 4324 bytes

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