Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95b3b4d5a806b36…

MALICIOUS

PDF

144.3 KB Created: 2021-05-15 19:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 582b7d552dd1281f3c30a74b46487967 SHA-1: 7c3b95121ca7144aeba8113be90ebf7d160c9341 SHA-256: e95b3b4d5a806b365d16ee10cbc8a94077f4ac335ac52e817709c52bbb3dae25
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 potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were directly extracted, the presence of numerous external links implies an attempt to redirect the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ponafet.ru/strik?utm_term=poisson+process+pdf
    • https://static.s123-cdn-static.com/uploads/4450256/normal_5fedccab1ee00.pdf
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/3820644.pdf
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fda825005996.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_6039811302f78.pdf
    • http://zupedaganivo.66ghz.com/87005519520.pdf
    • https://cdn-cms.f-static.net/uploads/4480174/normal_600c8c76a4a80.pdf
    • https://static.s123-cdn-static.com/uploads/4417208/normal_5feef21a8189f.pdf
    • https://cdn-cms.f-static.net/uploads/4422373/normal_603e8349ddef8.pdf
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/vunubamokazos.pdf
    • https://static.s123-cdn-static.com/uploads/4497658/normal_6007e1010e159.pdf
    • https://cdn-cms.f-static.net/uploads/4447280/normal_605d0eda591aa.pdf
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/beff551027a95b3.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60323e537ba2b.pdf
    • https://cdn-cms.f-static.net/uploads/4418167/normal_6016dedf604f9.pdf
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5fc85c3b3dfb7.pdf
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd76b7032db9.pdf
    • https://static.s123-cdn-static.com/uploads/4407986/normal_5ffca3131a806.pdf
    • https://cdn-cms.f-static.net/uploads/4413575/normal_6018caf1986c3.pdf
    • https://nomabedipami.weebly.com/uploads/1/3/1/4/131437379/jezise.pdf
    • https://cdn-cms.f-static.net/uploads/4425921/normal_604039b879adc.pdf
    • https://cdn-cms.f-static.net/uploads/4488806/normal_6049e5602417d.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fe8c9d9ed501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://figejadinopi.rf.gd/python_string_format_variable_padding.pdf
    • http://lufusemeg.epizy.com/acidosis_metabolica_tratamiento_nutricional.pdf
    • http://sekoran.rf.gd/55868156778.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dbcc.bin
eba9ee6abb75186f58a926e0be6e9640266cfcb4a111f6909231f67e0c2e2704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBCC 4908 bytes
font_01_sfnt_off0001ec95.bin
e5a1fb2d44ecdf0ad1485aebbc12de28ec05f514ae65cb7ab788b2b1f19fe874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC95 14376 bytes
font_02_sfnt_off00021c5d.bin
edbbfea9a1311a4351755d6ab59a8d7f5150d0d4081b02615932aaceaba441c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21C5D 16396 bytes

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