Malicious PDF — malware analysis report

Static analysis result for SHA-256 4680973833a78d0f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-06 01:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2e559e677bac8d900a3bb70d248f7626 SHA-1: ae26be249594d4a60aadd9e351be8b0e51077547 SHA-256: 4680973833a78d0fa010c94b5c631b6adaee77e8010db40e3f9fc38f08d3c556
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to direct users to external sites, potentially for 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://jumiwimov.ru/strik?utm_term=php+html+rich+text+editor PDF link annotation
    • https://bufodenoziro.weebly.com/uploads/1/3/4/5/134585066/kamizabagazuv-guwobur-vapikotidakaz-tisupono.pdfIn PDF document text
    • http://molotkov.site/17076448866k97sb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470835/normal_5fed90ced367f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5ff871cdd3bb7.pdfIn PDF document text
    • http://nonly.xyz/61755830544jejlc.pdfIn PDF document text
    • https://xabejopoturidu.weebly.com/uploads/1/3/4/3/134352457/tunibuf_kapawimugu_wovapexu_dipeze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602d6dc5a861f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_603b0f893013f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_60381aad94bee.pdfIn PDF document text
    • https://mesajenijapab.weebly.com/uploads/1/3/0/9/130969967/jozikewabalowe_wipolasixuxo.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/nubametofoduvonikudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5ff1128f900fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_602c6cf60f3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_60172c7400ea6.pdfIn PDF document text
    • http://madewithsunshine.com/ardy_knights_thieving_guidef0qxd.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/numegubowalonan/phenol_chloroform_isoamyl_alcohol_function.pdfIn PDF document text
    • https://20d2f084-0b1b-4cf0-9f58-0b75a0228a77.filesusr.com/ugd/e2f197_d98a38731fa242a6bf1307cdf7f6a8f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/how_to_write_a_script_for_a_childrens_book.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/44265651476.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_6af6708c0e50499cbd378a7c869c4fed.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 4996 bytes
SHA-256: ec4f01711a60d14f5afa80c42149447b08157d8dd0231f98e1135a7c23d78acf
font_01_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 11768 bytes
SHA-256: 2466cdfa80eddf8bdad4dab9bcefe4244ccd17f9eea587262fa8aaeb96b2f200
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 16488 bytes
SHA-256: 82671152c878833e3f9abfdac7c8bff42fcc51026bb08f296acc876f37e34aae