Malicious PDF — malware analysis report

Static analysis result for SHA-256 a947b08641835358…

MALICIOUS

PDF

79.4 KB Created: 2021-04-04 19:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 89fd73467b23cc8a6cfecd2d188fa46e SHA-1: cdf6c56d58fdd64bb334c4032e8e8c8316f60c53 SHA-256: a947b08641835358158255c240ff33c37bff9462f8c7109b6b0c87b636490b03
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to benign-looking documents, but one key URL points to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of external links and the ML classification strongly suggest malicious intent, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ponafet.ru/award?keyword=aesculap+neurosurgery+main+catalogue+pdf PDF link annotation
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/173564b6.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/wigov.pdfIn PDF document text
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/7e4295db1d663e.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/f8bb2f616ba93.pdfIn PDF document text
    • http://xadixul.66ghz.com/itunes_for_laptop_windows.pdfIn PDF document text
    • https://lanutitokoxoziv.weebly.com/uploads/1/3/4/0/134096970/jofeweferubof_ravat_lovadutuzu.pdfIn PDF document text
    • https://wojanoxunoliwam.weebly.com/uploads/1/3/5/3/135394081/290460a14e0.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/wibudas.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/leweg.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/orchestral_instruments.pdfIn PDF document text
    • http://lemovifi.iblogger.org/what_is_firmament_in_the_bible.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/fadomuxoper.pdfIn PDF document text
    • https://netevidogewe.weebly.com/uploads/1/3/4/7/134715311/pidaw.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/bivopavimu.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/5735390.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/lewuli/agriculture_science_and_technology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/cursive_name_handwriting_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/rivaxaval.pdfIn PDF document text
    • http://fevufanitefega.epizy.com/sena_bluetooth_20s_evo_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/kazuxowufixinuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/best_free_video_chatting_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/ratojokerafa.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/62536987084.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/org_chart_template_powerpoint_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/46406199079.pdfIn PDF document text
    • http://pariwexeral.epizy.com/94360250450.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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 5564 bytes
SHA-256: e93dfd816be79214e927146d38497df90b3689646b591ce2eecf389365921277
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 9904 bytes
SHA-256: e8b11bfe46f1673b35e9a758bc91190a478a703f5a832caf74e0bf31d763f1b9

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