Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef55412da4a8c30…

MALICIOUS

PDF

69.8 KB Created: 2021-04-19 07:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c79daa6e0e65804acf4fc616cfd945dc SHA-1: 03f753561fc39870e78939ef95901531ccba5c85 SHA-256: 8ef55412da4a8c30696e422e8ae3114b85a094f9afa5a39f4a8667030f2380cb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL pointing to a site related to 'Macbeth act 1 scene 3 and 4 quizlet'. This suggests a phishing or social engineering lure. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=macbeth+act+1+scene+3+and+4+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425511/normal_604b168177121.pdfIn PDF document text
    • http://vvinorama.website/neonatal_meningitis_treatment_guidelinesatsds.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/mW9CjL3/92455535581.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/jgfniiA/jesax.pdfIn PDF document text
    • https://cdn.sqhk.co/jebanufebejo/FVhgDgi/ates_ve_su_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_60314787a5ee9.pdfIn PDF document text
    • http://mavito.online/849163532570hig3.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_60450964d05e2.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/ihAhggg/skyward_ecisd_survey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_6059d5ee22214.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/yZ93gdU/15174892359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450719/normal_603d1a9e9db7f.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/Kjjhlhc/sekazuxenedajixuxoperam.pdfIn PDF document text
    • http://airned.ru/zobezupixokamaxobavibobettr82s.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/hfQojgU/68118925462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_5f310354c54d4052aaa3fee0ba2e5977.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_1df52eab07d14b918e36af0096373d99.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_c2b50b9691cb447f9b2670f426e88a40.pdf?index=trueIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_d99e9c3c532a4ba28dbfffe29e6c036c.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_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 5556 bytes
SHA-256: 40087695d83bd3a5ba89ab00b1682e0cd2c2ec5503231e34d890b8864cf58ccd
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 10320 bytes
SHA-256: b7186c8c1969506cdff40931634c52f434e1c474d1aee692781aa12b4a40051c

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