Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90ff39152d54120…

MALICIOUS

PDF

76.6 KB Created: 2021-04-06 12:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 60720e87fda6753582923cd1eb55c9e2 SHA-1: e7827dc8658e5e63311e6f79e886da44e0cac52a SHA-256: f90ff39152d541207f713c778bd4ef732e9c6a12dfc2a25fe166ecb5c1de32c1
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 a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=fnaf+the+silver+eyes+free+ebook+download PDF link annotation
    • http://openplafond.xyz/volavudogelegawalbe890.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/lCLifUH/85979378540.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/kulaxawagojuso_kodadulagafi_wesipiso_mulofoxe.pdfIn PDF document text
    • http://promooffer.site/816636271648999u.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/ejftM3J/xekaxonavulosepafeberumim.pdfIn PDF document text
    • http://lumacy.site/aha_music_apk2tyhw.pdfIn PDF document text
    • https://diwekapuxejube.weebly.com/uploads/1/3/1/4/131455019/pukomigumuz.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/jfgfxCn/obsessive_list_makers_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/lufezeralon/hjiyIhe/45130848895.pdfIn PDF document text
    • https://cdn.sqhk.co/pudinivil/hejjdq0/favufal.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/X5hdQha/act_bubble_sheet_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/ff5XiaT/54564676983.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/nagudo/savevokoxazetunikewudajud.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/nattamai_tamil_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/vayne_guide_lol_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/nigivejufijulonow.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/lurovowunaxuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/molevabuf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 5408 bytes
SHA-256: 0ebb79be0b90bc1d551109b914745534f601049167c6034b9380f1e6f29dd957
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 11004 bytes
SHA-256: 17a38ad61909f05da0540edcd6cf9ed260ef5615c32879bf55d0b81d460d8397

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