Malicious PDF — malware analysis report

Static analysis result for SHA-256 da894a1a647e9d6a…

MALICIOUS

PDF

80.8 KB Created: 2021-04-26 10:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13cc2f7016eb0a08b575166d6a5eeb16 SHA-1: 21fb9cfcff46445b2604936b1e010992f7851741 SHA-256: da894a1a647e9d6a9e4fa85433ea0db84d924d0ed5b5c6a41d77a26435c7e153
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 domains designed to host SEO spam. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm. The embedded URL and the ClamAV detection further support a phishing and malicious intent. The document body, though heavily obfuscated, contains text related to Netflix movies, suggesting a lure to trick users into visiting the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what%2527s+the+best+movies+on+netflix+right+now
    • http://reform-st.ru/fonomafogadutosupejugucst9j.pdf
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/bopem.pdf
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/78a3fa.pdf
    • http://axacheat4.xyz/soluciones_amortiguadoras_de_ph59xuq.pdf
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/dajefexomonifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/23a5d287-d6df-4c9a-8817-9c71031174f3/koxerogorekesegupulokoki.pdf
    • https://uploads.strikinglycdn.com/files/fbf3540c-0ac3-4798-84dc-c4edb8c4c937/forever_war_dexter_filkins.pdf
    • https://s3.amazonaws.com/befafuni/acceptance_in_balance_sheet.pdf
    • https://s3.amazonaws.com/dowavelaxam/approval_letter_format_for_purchase.pdf
    • https://s3.amazonaws.com/sefipa/wenid.pdf
    • https://96a604d4-6f4e-42dc-90fb-b802e1cf4ed0.filesusr.com/ugd/6ef60c_aeeda6625735422dac1db24465df75c1.pdf?index=true
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_cc425239ab904fcfa750f04bf543696e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7132d74f-c26a-4c5a-9a9f-1cc49cd6231d/the_courage_of_sarah_noble_comprehension_questions.pdf
    • https://s3.amazonaws.com/nawuvud/who_opposed_johnsons_plan_for_reconstruction.pdf
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_b27f317c35884d6a9f031b02d9eba9a5.pdf?index=true
    • https://s3.amazonaws.com/jukoxisojow/43866657642.pdf
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_1cc1dc6b81df4ed9b116c4c2842fb2e5.pdf?index=true
    • https://s3.amazonaws.com/perurulexi/supaxekugaxetal.pdf
    • https://s3.amazonaws.com/fuwawibu/53432597379.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f225.bin
2046f6a5e1540dc36c76a7f832149518d8234b27d270231d4a30c22c7a8deecb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 5376 bytes
font_01_sfnt_off00010466.bin
250bfa8709ef34f6d0b0b5ad88d2532d001be65c679864ed075bd8df90fe5ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10236 bytes
font_02_sfnt_off0001277c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 4324 bytes