Malicious PDF — malware analysis report

Static analysis result for SHA-256 52aeb614773d1389…

MALICIOUS

PDF

114.9 KB Created: 2020-12-20 17:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 311a5e8923baf73dce6e4ce54df0ff21 SHA-1: 98d7cdf4e5f43654750c01446203cef4de440bdd SHA-256: 52aeb614773d1389fe6cf2ddcfe9596593e581ecef8759ac328b56c5b72330a5
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/strik?utm_term=types+of+consonants+in+kannada PDF link annotation
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/sobadotu_jadixogufagiv.pdfIn PDF document text
    • https://rarekupop.weebly.com/uploads/1/3/4/0/134012473/powegibulidufabi.pdfIn PDF document text
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/ruxubadoxozuwulosisi.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/vugizugezux.pdfIn PDF document text
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/jobujo_jozef_foleribulagag_wubekife.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/5990571.pdfIn PDF document text
    • https://tigekinoninufuv.weebly.com/uploads/1/3/4/6/134687643/vanegotabo.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/sitelu-natibevi-radad-ranotuliwi.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc5c2fbea4a794d56668ff8/t/5fcebbca7222f03c23cee694/1607384010411/garokefufunuruzite.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd52f507af9e0e16f5551b/t/5fddd3e642c0045a33eb8a3c/1608373224133/king_assamese_album_songs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fd9af9866f3fd2d4d777/t/5fc2b8abe6d49a06bbec4a73/1606596780295/selenium_interview_questions_guru99.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000128cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128CD 38480 bytes
SHA-256: 5227f774f32fcc153b4b2f3799015e9f338e9fae06cdf622b1ce78c16edd0712
font_00_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 4924 bytes
SHA-256: 0e60c0000b69eb4df1fd25051b8907dc9e0b92ba2924d92e933d78525449def7
font_02_sfnt_off000170ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AE 13080 bytes
SHA-256: 4e6025803e1cc33f57f7873589da38531ef64f1149c9b599d03a2780af4eae16
font_03_sfnt_off00019a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A62 16148 bytes
SHA-256: 4ee87c26958286c59ea15fb8b20687dc23a3b3d6f2545a18e085576f6f8f4ad3
font_04_sfnt_off0001af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF71 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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